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WO2000073572A1 - Procede de digestion de matiere lignocellulosique - Google Patents

Procede de digestion de matiere lignocellulosique Download PDF

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Publication number
WO2000073572A1
WO2000073572A1 PCT/JP2000/003402 JP0003402W WO0073572A1 WO 2000073572 A1 WO2000073572 A1 WO 2000073572A1 JP 0003402 W JP0003402 W JP 0003402W WO 0073572 A1 WO0073572 A1 WO 0073572A1
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WO
WIPO (PCT)
Prior art keywords
cooking
liquor
digestion
zone
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2000/003402
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English (en)
Japanese (ja)
Inventor
Masahiro Shimizu
Keigo Watanabe
Tatsuya Andoh
Makoto Nakao
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kawasaki Kasei Chemicals Ltd
Nippon Paper Industries Co Ltd
Jujo Paper Co Ltd
AGC Inc
Original Assignee
Kawasaki Kasei Chemicals Ltd
Asahi Glass Co Ltd
Nippon Paper Industries Co Ltd
Jujo Paper Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kawasaki Kasei Chemicals Ltd, Asahi Glass Co Ltd, Nippon Paper Industries Co Ltd, Jujo Paper Co Ltd filed Critical Kawasaki Kasei Chemicals Ltd
Priority to AU47814/00A priority Critical patent/AU4781400A/en
Publication of WO2000073572A1 publication Critical patent/WO2000073572A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/222—Use of compounds accelerating the pulping processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/02—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes
    • D21C3/022—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes in presence of S-containing compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C7/00—Digesters

Definitions

  • the present invention relates to a cooking method for lignocellulosic material, and more specifically, can further improve the pulp yield and further improve the relationship between monovalent kappa and pulp yield, as compared with the conventional cooking method.
  • the present invention relates to a method for cooking lignocellulosic material capable of reducing kappa monovalent at the same effective alkali addition rate and improving pulp yield at the same power kappa.
  • the main method of manufacturing chemical pulp that has been industrially implemented so far is alkaline digestion of lignocell mouth material such as wood chips, of which sodium hydroxide and sodium sulfide are the main components.
  • the kraft method using a refining cooking liquor is widely used.
  • a cooking method in which a quinone compound which is a cyclic keto compound such as anthraquinone sulfonate or anthraquinone-tetrahydroanthraquinone is added to a cooking system as a cooking aid (for example, Japanese Patent Publication No. 55-13998, Japanese Patent Publication No. 57-192, 39, Japanese Patent Publication No. 53-4544, Japanese Patent Publication No. 52-37803 ) It has been known.
  • the quinone compound improves the selectivity of delignification, contributes to the reduction of monovalent kappa of the digested pulp and the improvement of the yield.
  • a polysulfide cooking method in which an alkaline cooking liquor containing polysulfide is used for cooking is also a very effective method for improving the yield.
  • Polysulfide oxidizes the carboxy terminus of carbohydrates and suppresses the decomposition of carbohydrates by the peeling reaction, thereby contributing to improved yields.
  • the alkaline cooking liquor containing polysulfide is produced by oxidizing an alkaline solution containing sodium sulfide with molecular oxygen such as air in the presence of a catalyst such as activated carbon (for example, Japanese Patent Publication No. 50-4). No. 0 395, JP-A-61-25772, JP-A-61-259,754).
  • Alkaline cooking A liquid can be obtained.
  • thiosulfate ions which do not contribute to the digestion at all, are produced as by-products, which makes it difficult to produce alkali-rich cooking liquor containing high concentrations of polysulfide with high selectivity.
  • PCT International Publication Nos. WO 95/07701 and WO 97Z007 71 describe an electrolytic production method of an alkaline cooking liquor containing polysulfide. According to this method, an alkaline cooking liquor containing a high concentration of polysulfide sulfur can be produced at a high selectivity with extremely low by-product of thiosulfate ion. As another method of obtaining an alkaline cooking liquor containing a high concentration of polysulfide sulfur, there is a method of dissolving molecular sulfur in an alkaline aqueous solution containing sodium sulfide. Further, Japanese Patent Application Laid-Open No.
  • the MCC method differs from the conventional craft method in that the cooking liquor is divided and added to the upper cooking zone at the beginning of cooking and after the cooking temperature reaches the maximum temperature. The feature is that it is implemented. Countercurrent refers to the case where the flow direction of the cooking liquor is from the bottom to the top of the kettle.
  • the pulp strength is improved and the kappa value is reduced in the MCC method, there are problems such as an increase in cooking temperature and an increase in cooking chemicals per lignocellulosic material. It was not connected.
  • the cyclic keto compound is added at the beginning of the digestion (permeation vessel).
  • a cyclic keto compound is added to the upper digestion zone or the like
  • Japanese Patent Application Laid-Open No. in Japanese Patent Application Laid-Open No. Hei 4-209896, when the cyclic keto compound is added to the lower cooking zone, the cyclic keto compound is added to the upper cooking zone and the lower cooking zone at the beginning of the cooking. It discloses the case of addition, but does not describe the difference in effect between each addition method, and it is unclear how to add the quinone compound, which is a cyclic keto compound in polysulfide cooking, more effectively. It is.
  • Lo—So1ids registered trademark
  • the extraction strainer at the top of the upper cooking zone that is, countercurrent cooking, that is, at the bottom of the top zone, or the extraction at the bottom of the lower cooking zone, that is, cocurrent cooking, that is, the upper part of the cooking washing zone that is countercurrent cooking.
  • Most of the cooking black liquor is extracted from the strainer, and the concentration of organic solids in the digester is kept low.
  • Cooking chemicals are also consumed by organic components eluted from the lignocellulosic material in addition to delignification elution reaction of the lignocellulosic material.
  • the digestion liquor containing organic components is extracted from several places in the digester, and the digestion liquor is supplied not only at the beginning of the digestion but also during the digestion so that the black liquor in the digester is supplied.
  • the concentration of dissolved organic matter mainly composed of lignin is reduced, the consumption of cooking chemicals by the dissolved organic matter is suppressed, and the selectivity of delignification during cooking is improved. As a result, improvements in pulp strength, reduction in cooking chemicals used, etc. were achieved.
  • the present invention solves the above-mentioned problems, and provides a two-vessel digester with a plurality of digesters. Extraction of cooking black liquor from the location and addition of an alkaline cooking liquor to the top of the digester and a predetermined cooking zone, in which the polysulphide cooking, which contributes to an increase in the yield, is carried out. It is an object of the present invention to provide a method for cooking a lignocellulose material that can use a quinone compound as described above more effectively.
  • Another object of the present invention is to provide an improved method for further improving pulp yield, further improving the relationship between monovalent kappa and pulp yield, and reducing the amount of chemicals required for cooking and bleaching. That is, an object of the present invention is to reduce kappa monovalent at the same effective alkali addition rate and improve pulp yield at the same power alkali monovalent. Disclosure of the invention
  • the present invention is a two-vessel digester in which an infiltration vessel is installed in front of a digester, comprising a top zone, an upper digestion zone, and a lower digestion zone from the top to the bottom inside the digester. Strainers are provided at the bottom of each zone, and at least one of the strainers is used to discharge cooking black liquor extracted from at least one strainer to the outside of the digestion system. Alternatively, use softwood chips.Contain polysulfide sulfur at a concentration of 3 to 20 g ZL as sulfur and 45 to 50% of total cooking active sulfur and total alkali contained in the alkaline cooking liquor introduced into the cooking system.
  • FIG. 1 is a diagram showing an example of a two-vessel digester-type apparatus for performing the digestion method of the present invention.
  • the present invention includes a permeation vessel and a digester main body, a top zone, an upper digestion zone, and a lower digestion zone from the top to the bottom inside the digester, and a strainer is provided at the bottom of each zone; and
  • the continuous cooking method uses a 2-vessel digester in which at least one of the strainers extracts cooking liquor extracted from at least one strainer to the outside of the cooking system.
  • black liquor discharged outside the digestion system may be extracted from a strainer installed at the bottom of the tower top zone.
  • different cooking compositions of different compositions are added from the top of the infiltration vessel, the upper cooking zone and elsewhere.
  • the alkaline cooking liquor used in the present invention include a solution mainly composed of polysulfide and sodium hydroxide, a solution mainly composed of sodium hydroxide and sodium sulfide, or a solution mainly composed of sodium hydroxide. Etc. are used.
  • the total amount of chemicals contained in the alkaline cooking liquor introduced into the digestion system from each location is 10 to 25% by weight of effective alkali (2 for absolutely dry chips supplied to the vessel digester).
  • N weight 0/0 of a 2 0) is from 1 to 1 0 wt% in the digestion sulfur-content (wt% sulfur for the bone-dry chips to be supplied to the secondary base Sseru digester).
  • an alkaline solution containing polysulfide sulfur at a concentration of 3 to 20 g ZL as sulfur is supplied to the top of the permeation vessel.
  • the concentration of polysulfide sulfur is preferably between 8 and 8 g ZL.
  • polysulfides contribute to increased yields through carbohydrate protection, they lack stability at high temperatures (above 120 ° C) and decompose at the highest cooking temperature with consumption of sodium hydroxide.
  • the alkaline cooking liquor containing polysulphide is added to the L 0 — S 0 lids (registered trademark) method in the 2-vessel digester of the present invention in a divided manner during the cooking, it is supplied during the cooking. In this case, the polysulfide is immediately exposed to high temperature, is decomposed, and the yield improvement effect cannot be sufficiently obtained.
  • polysulfide sulfur concentration is within the above concentration range necessary to obtain the effect of improving the yield.
  • polysulfide sulfur at a concentration of 3 to 20 gZL as the sulfur content. If the concentration of polysulfide sulfur in the first cooking liquor is less than 3 g ZL, little contribution to the increase in yield appears, and if it exceeds 20 g ZL, it cannot contribute to the carbohydrate protection reaction, and the remaining polysulfite As the cooking process reaches the maximum temperature, it undergoes decomposition and at the same time consumes the sodium hydroxide required for the cooking process, making it impossible to secure the alkali content required for the cooking process. The price is also very high.
  • a force s' which can be obtained by a conventional air oxidation method, and a part of the polysulfide is converted to sodium thiosulfate due to the air oxidation of the polysulfide.
  • a solution containing sulfide ions such as sodium hydroxide and sodium sulfide, or sodium-carbonate and sodium sulfide as main components is preferred because of disadvantages such as side reactions.
  • O method of electrochemically oxidizing sulfide ions in the gas that is,
  • the following electrolysis method can be applied [(A) Japanese Patent Application No. 10-166636, (B) Japanese Patent Application No. — 5101-6, (C) Japanese Patent Application No. 111-151033).
  • polysulfide sulfur refers to, for example, sulfur having a valence of 0 in sodium polysulfide Na 2 SX, that is, sulfur for (X—1) atoms.
  • sulfur with the oxidation number of 12 in polysulfide ion polysulfide
  • the equivalent of sulfur (S x 2 — or Na 2 S x 1-sulfur sulfur) and sulfide ion (S 2- ) is referred to as Na 2 S-form sulfur as appropriate.
  • the Porisarufua Lee de means a combination of the Porisarufua Lee Dosarufa and N a 2 S Tai ⁇ yellow, and N a 2 S state sulfur and sodium sulfide (N a 2 S) N
  • the Na 2 S portion of a 2 SX, and the digestion-active sulfur portion refers to the sum of polysulfide sulfur and Na 2 S-state sulfur among the sulfur components that contribute to the cooking reaction. .
  • Japanese Patent Application No. 10-16663 / 74 is based on a three-dimensional physically continuous mesh composed of nickel or nickel alloy containing at least 50% by weight of nickel. It has the structure and anode surface area of anodic per unit volume of de chamber 5 0 0 ⁇ 2 0 0 0 0 m 2 / m 3 and is anodic chamber disposing a porous anodic, the force Sword A solution containing sulfide ions is introduced into the anode chamber of an electrolytic cell having a diaphragm that separates the cathode chamber, the anode chamber, and the cathode chamber to be provided, and the polysulfide is introduced by electrolytic oxidation.
  • a cooking liquor having extremely low by-products of thiosulfate ion, containing a high concentration of polysulfide-sulfide 7, and having a large amount of residual Na 2 S-form is selected. It is possible to produce pulp at low power while maintaining the selectivity. The rate can be increased effectively.
  • the electrolysis operation is performed under conditions where the pressure in the force source chamber is greater than the pressure in the anode chamber.
  • the electrolytic cell generally has a structure in which a diaphragm is sandwiched between an anode and a cathode. From the viewpoint of assembly accuracy and protection of the diaphragm, anode and
  • the diaphragm arranged between them approaches the anode side or approaches the cathode side depending on the electrolysis conditions.
  • the diaphragm is forced into constant contact with the anode, there is no space between the anode and the diaphragm, and the anode liquid is entirely introduced into the porous anode. It improves current efficiency and other factors.
  • electrolysis is performed under conditions where the pressure in the force chamber is higher than the pressure in the anode chamber.
  • the diaphragm is pressed against the anode, so that the anolyte solution can sufficiently flow inside the porous anode, and a high selectivity can be realized.
  • the flow rate of the solution (power source liquid) introduced into the force chamber is introduced into the anode chamber.
  • the technology disclosed in Japanese Patent Application No. 11-501103 is based on an anode chamber in which a porous anode is provided, a power sword chamber in which a power source is provided, and a diaphragm that partitions the anode chamber and the power sword chamber.
  • a method for producing polysulfide in which a solution containing sulfide ions is introduced into an anode chamber of an electrolytic cell having the same, and polysulfide ions are obtained by electrolytic oxidation, wherein the porous anode is a porous anode.
  • the porous anode is arranged so as to have a void at least partially between the anode and the diaphragm, and the apparent volume of the porous anode is 60% to 99% with respect to the volume of the anode chamber.
  • This is a method for producing a characteristic polysulfide. According to this method, a by-product of thiosulfate ion is extremely small, a high concentration of polysulfide sulfur is contained, and a cooking liquor with a large amount of residual Na 2 S is maintained at a high selectivity. It can be produced, and the pulp yield can be effectively increased by using the polysulfide cooking liquor thus obtained for cooking. In addition, pressure loss during the electrolysis operation can be reduced, and clogging of SS (suspended matter) can be suppressed.
  • the porous anode is disposed so as to have a void in at least a part between the porous anode and the diaphragm, and the apparent volume of the porous anode is reduced by the amount of the anode. It is configured to be 60% to 99% of the volume of the storage chamber.
  • the volume of the anode chamber is the volume of the space defined by the effective energizing surface of the diaphragm and the apparent surface of the portion of the anode liquid flowing farthest from the diaphragm.
  • the gap formed between the anode and the diaphragm may be formed on the entire effective conducting surface of the diaphragm, or may be formed on a part thereof.
  • the void is continuous as a flow path. If the apparent volume exceeds 9.9%, the pressure loss during electrolysis is large, and the suspended solids are easily clogged, which is not preferable. If the apparent volume is less than 60%, the amount of the anode liquid flowing through the porous anode becomes too small, and the current efficiency becomes poor. Within this range, the electrolysis operation can be performed with a small pressure loss and without the risk of clogging while maintaining good current efficiency. More preferably, this value is set between 70 and 99%.
  • this gap has the advantage that the flow of the anolyte solution is smooth, and that deposits can be made to collect on the anodic surface of the diaphragm.
  • the present invention is particularly suitable for producing a polysulfide and obtaining a Na aH solution.
  • a white liquor or a green liquor is introduced into the anode chamber of the electrolytic cell, that is, the anode side, and the polysulfide produced here is introduced. It is used as it is, or after causticizing, by adding it before the chips reach their maximum temperature. It is also used by adding NaOH (containing a small amount of KOH) solution generated in the cathode chamber of the electrolytic cell, that is, on the cathode side, after the chip reaches the maximum temperature.
  • the alkaline cooking liquor containing sodium hydroxide and sodium sulfide as the main components is used for the anode chamber where the anode is located, the cathode chamber where the cathode is located, and the diaphragm that separates the anode chamber from the cathode chamber. It is continuously supplied to the anode chamber of the existing electrolytic cell.
  • the anode material is not particularly limited as long as it is alkaline and has oxidation resistance, and a nonmetal or metal is used.
  • a nonmetal or metal for example, a carbon material can be used, and as the metal, for example, a base metal such as nickel, cobalt, or titanium, an alloy thereof, a precious metal such as platinum, gold, or rhodium, or an alloy or oxide thereof be able to.
  • a structure of the anode it is preferable to use a porous anode having a physically three-dimensional network structure. Specifically, for example, in the case of a nickel anode material, a porous nickel obtained by applying nickel plating to the skeleton of the foamed polymer material and then firing and removing the internal polymer material can be used.
  • At least the surface of the anode chamber is made of nickel or a nickel alloy containing nickel at least 50% by weight. has a dimension network structure, and to distribution and surface area of ⁇ Roh one de per unit volume of the anodic chamber is 5 0 0 ⁇ 2 0 0 0 0 m 2 / m 3 porous ⁇ Roh one de . Since at least the surface of the anode is nickel or nickel alloy, it has sufficient durability for practical use in the production of polysulfide.
  • the surface of the anode is preferably nickel, and nickel alloy containing nickel of 50% by weight or more can be used, and nickel content is more preferably 80% by weight or more. .
  • Nickel is relatively inexpensive, and its elution potential and oxide formation potential are higher than those of polysulfide sulfathiothiosulfate. It is a suitable electrode material for obtaining polysulfide sulfur by electrolytic oxidation. In addition, since it is porous and has a three-dimensional network structure, it has a large surface area, and when used as an anode, the desired electrolytic reaction occurs on the entire surface of the electrode to suppress the generation of by-products Can be. Further, unlike the aggregate of fibers, the anode has a physically continuous network structure, so that it exhibits sufficient electrical conductivity as an anode and can reduce the IR drop at the anode. Therefore, the cell voltage can be further reduced. In addition, since the anode has good electrical conductivity, it is possible to increase the porosity of the anode and reduce the pressure loss.
  • the volume of the anode chamber is a volume defined by an effective current-carrying surface of the diaphragm and a current collector of the anode. If the surface area of the anode is smaller than 500 n ⁇ Zm 3 , the current density on the anode surface will increase, and not only will by-products such as thiosulfate ions be easily generated, but also nickel will be reduced. This is not preferred because it tends to cause the dissolution of the anode.
  • the surface area of the anodic may anode It is preferably 2 to 100 m 2 / m 2 per unit area of the diaphragm separating the pressure chamber and the force source chamber. More preferably, the surface area of the anode is 5 to 50 m 2 Zm 2 per unit area of the diaphragm.
  • the average pore size of the mesh of the anode is preferably 0.1 to 5 mm. If the average pore size of the mesh is larger than 5 mm, the anode surface area cannot be increased, the current density on the anode surface increases, and only by-products such as thiosulfate ions are easily generated. In addition, nickel is not preferred because nickel easily dissolves the anode. If the average pore diameter of the mesh is smaller than 0.1 mm, it is not preferable because a problem in electrolysis operation such as an increase in pressure loss of the liquid may occur. More preferably, the average pore size of the anode mesh is 0.2 to 2 mm.
  • the anode of the three-dimensional network structure has a diameter of the wire material constituting the network of 0.01 to Preferably it is 2 mm. Wires with a diameter of less than 0.01 mm are not preferred because they are extremely difficult to manufacture, costly and difficult to handle. If the diameter of the wire exceeds 2 mm, a large surface area of the anode cannot be obtained, the current density on the anode surface increases, and by-products such as thiosulfate ions are easily generated. I don't like it. It is particularly preferable that the diameter of the filament material constituting the mesh is from 0.02 to Imm.
  • the anode may be arranged to fill the anode chamber so as to be in contact with the diaphragm, or may be arranged so as to have some gap between the anode and the diaphragm. Since the liquid to be treated needs to flow through the anode, it is preferable that the anode has sufficient voids.
  • the porosity of the anode is preferably 90 to 99%. If the porosity is less than 90%, the pressure loss at the anode increases, which is not preferable. If the porosity exceeds 99%, it is not preferable because it is difficult to increase the surface area of the anode. It is particularly preferable that the porosity is 90 to 98%. (C) In the technology disclosed in Japanese Patent Application No.
  • the current density at the diaphragm surface is less than 0.5 kA / m 2 , unnecessarily large electrolytic equipment is required, which is not preferable. If the current density at the diaphragm surface exceeds 2 0 k A / m 2, not only increases the Chio sulfate, sulfate, by-products such as oxygen, lay preferred because nickel is likely to undergo Ano de dissolution Absent. It is more preferable that the current density at the diaphragm surface is 2 to 15 kA / m 2 .
  • an anode having a large surface area is used for the area of the diaphragm, it can be operated in a range where the current density on the anode surface is small. Since the anode has a large surface area, the current density on the anode surface can be reduced.
  • the current density on the surface of the anode is calculated from the surface area of the anode, assuming that the current density on the surface of each part of the anode is uniform, the value is 5 to 300 A / m 2. It is preferable that Yo more preferable range is 1 0 ⁇ 1 5 0 0 A / m 2.
  • this anode is a physically continuous network structure and has sufficient electrical conductivity, so that the IR drop in the anode is kept small while maintaining the gap of the anode. The rate can be increased. Therefore, the pressure loss of the anode can be reduced.
  • the average superficial velocity of the anode chamber is preferably 1 to 30 cmZ seconds.
  • the flow velocity of the force source liquid is not limited, but is determined by the magnitude of the floating force of the generated gas.
  • a more preferable range of the average superficial velocity in the anode chamber is 1 to 15 cmZ seconds, and a particularly preferable range is 2 to 10 cmZ seconds.
  • an alkali-resistant material is preferable.
  • nickel, Raney-nickel, steel, stainless steel and the like can be used.
  • the force source may be a single plate or mesh, or a plurality of layers may be used in a multilayer structure.
  • a three-dimensional electrode combining linear electrodes can also be used.
  • the electrolyzer a two-chamber type electrolyzer comprising one anode chamber and one force sword chamber or an electrolyzer combined with three or more chambers is used. Many electrolyzers are monopolar or bipolar Can be arranged in the structure.
  • a cation exchange membrane As a membrane separating the anode chamber and the cathode chamber. Cation exchange membranes guide cations from the anode chamber to the force source chamber, preventing the transfer of sulfide and polysulfide ions.
  • a cation exchange membrane a polymer membrane in which a cation exchange group such as a sulfone group or a carboxylic acid group is introduced into a hydrocarbon-based or fluororesin-based polymer is preferable. If there is no problem in terms of alkali resistance and the like, a bipolar membrane, an anion exchange membrane, or the like can be used.
  • Electrolysis conditions such as temperature, current density, etc. are determined by multi-fluid ion (Sx 2) such as S 2 2 —, S 3 2 ”, S 4 2 —, S 5 2 _ as oxidation products of sulfide ions in the anode. —)
  • Sx 2 multi-fluid ion
  • the cooking liquor is the force to be added by dividing into a plurality of locations of penetration base Sseru and digester?,
  • the first cooking liquor is fed to the top of the infiltration vessel.
  • the first cooking liquor 45 to 100% by weight, preferably 50 to 100% by weight, based on the total amount introduced into the digestion system (infiltration vessel and digester) is used. It is important that 4 5-79 wt% of effective alkali, is preferred properly be effective Al force Li force? supply 50-60% by weight relative to the digester active sulfur, the total amount introduced into the cooking system .
  • the sulfur content of the cooking liquor of the first cooking liquor is less than 45% by weight, the first half of the cooking will be lacking in sodium sulfide, the selective delignification will not be performed, and the kappa of the pulp obtained by the cooking will not be obtained.
  • Good kappa valency and pulp yield can also be obtained when the cooking-active sulfur content of the first cooking liquor is 100% by weight.
  • the effective alkali of the first cooking liquor if it is less than 45% by weight, Shortage, and the yield is greatly impaired.
  • alkaline cooking mainly composed of sodium hydroxide and sodium sulfide or sodium hydroxide is used as a second cooking liquor. Liquid is supplied. The sulphidity of the cooking liquor at this time is 0 to 40%.
  • the same alkaline cooking liquor as the second cooking liquor is supplied from the bottom of the cooking washing zone in the latter half of the cooking.
  • an alkaline cooking liquor consisting mainly of polysulfide and sodium hydroxide is added together with chips at the top of the permeation vessel, and sodium hydroxide and sodium sulfide are added during the digestion in the digester.
  • the main component of the cooking liquid or sodium hydroxide is the main component of the cooking liquid.
  • 20 to 60% by volume of the whole digested black liquor sent directly from the digester to the recovery step may be extracted by the strainer at the bottom of the tower top zone and discharged to the outside of the digestion system. If the cooking liquor discharged to the outside of the digestion system at this point is less than 20% by volume of the total cooking liquor, a large amount of dissolved organic matter mainly composed of lignin remains in the digester, and the power after cooking The reduction in kappa price is small, and there is no improvement in the relationship between kappa monovalent and pulp yield.
  • a quinone compound per absolute dry chips 0. 0 1 to 1.5 by weight 0/0, preferably 0. 0 1 to 0.1 5 wt 0/0, more preferably 0. It is added to the first cooking liquor supplied to the top of the infiltration vessel or the second alkaline cooking liquor supplied to the bottom of the upper cooking zone so as to have a concentration of 0.2 to 0.06% by weight.
  • the quinone compound coexist as long as possible with the chips in the digester, and that the quinone compound be added where the delignification reaction in the digestion is in progress.
  • an alkaline cooking liquor containing polysulfide is supplied together with chips from the top of the digester.
  • a quinone compound is added so that the quinone compound and the polysulfide coexist as long as possible.
  • the addition position is preferably at the top of the permeation vessel.
  • the quinone compound used is a quinone compound, a hydroquinone compound or a precursor thereof as a so-called known cooking aid, and at least one compound selected from these can be used.
  • These compounds include, for example, anthraquinone, dihydroanthraquinone (for example, 1,4-dihydroanthraquinone), and tetrahydroanthraquinone (for example, 1,4,4a, 9a—tetrahydroanthraquinone, 1 , 2,3,4—tetrahydroanthraquinone, methylanthraquinone (for example, 1—methylanthraquinone, 2-methylanthraquinone), methyldihydroanthraquinone (for example, 2-methyl-1,4—dihydroanthraquinone), methyltetrahithone Quinone compounds such as droanthraquinone (for example, 1-methyl-1,
  • coniferous or hardwood chips are used, and any type of tree may be used.
  • conifers include spruce, douglas fir, pine, and cedar
  • hardwoods include eucalyptus, beech, and oak.
  • FIG. 1 is a diagram showing an example of a two-vessel digester-type apparatus for performing the digestion method of the present invention.
  • This is a preferred embodiment of a two-vessel type continuous digester.
  • the apparatus applied in the present invention is not limited to this embodiment.
  • the digester 2 is divided into 4 zones: top zone A, upper digestion zone B, lower digestion zone (:, and digestion washing zone D.
  • a strainer is provided at the bottom of each zone.
  • Upper extraction strainer 4 at the bottom of the first top zone A4, strainer 5 at the second upper digestion zone B, bottom 5, third lower digestion zone C
  • Lower extraction strainer 6 at the bottom, fourth digestion wash Strainer 7 at the bottom of zone D.
  • infiltration vessel E is installed in front of digester 2.
  • Chip 1 is supplied to the top of the infiltration vessel E.
  • a first alkaline cooking liquor composed mainly of polysulfide and sodium hydroxide is supplied via the supply pipe 3 at the top of the permeation vessel E.
  • the quinone compound-containing liquid supplied from the quinone compound supply conduit 16 is joined to the alkaline cooking liquor supply pipe 3 containing polysulfide, and supplied at the top of the permeation vessel E.
  • the chips filled at the top of the infiltration vessel E descend with the cooking liquor.
  • the infiltration vessel E is maintained at a relatively low temperature (about 120 ° C) for the purpose of infiltrating the first alcoholic cooking liquor and the quinone compound into the chip.
  • the first cooking liquor and the quinone compound are effectively penetrated into the chip, causing an initial delignification, and a lignin dissolution output from the chip to the cooking liquor.
  • the chips and cooking liquor descending from the permeation vessel E pass through the transfer feed pipe 21 Supplied to the top of demolition tank 2 and enters tower zone A. In the top zone A, the chips and the cooking liquor are further heated, delignification proceeds, and lignin elution into the cooking liquor further progresses.
  • a predetermined amount of the digested black liquor containing lignin eluted from the chip is extracted from the upper extraction strainer 4 and sent to the recovery step through the black liquor discharge conduit 10.
  • the cooking black liquor extracted from the strainer 5 provided at the bottom of the upper cooking zone B is connected to a second cooking liquor supply pipe, that is, an upper total cooking liquor supply pipe 8 in the extract liquid conduit 17.
  • the flowing alkaline cooking liquid containing sodium hydroxide and sodium sulfide or the alkaline cooking liquid mainly containing sodium hydroxide is combined and heated by a heater 14 provided in the flow path.
  • This circulating liquid that is, the upper cooking circulating liquid
  • the upper cooking circulating liquid conduit 19 near the strainer 5 at the bottom of the upper cooking zone B In the upper digestion zone B, the chips descend from the bottom of the upper extraction strainer 4 toward the upper part of the strainer 5, and during this time, the circulating digest supplied from the circulating fluid conduit 19 near the strainer 5 is extracted at the upper part. It rises toward the strainer 4, and the delignification reaction proceeds by countercurrent cooking by the action of the second cooking liquor.
  • the circulated cooking liquor rising toward the upper extraction strainer 4 is extracted as black liquor from the upper extraction strainer 4 and sent to a recovery step through a black liquor discharge conduit 10.
  • the chips delignified in the upper digestion zone B enter the lower digestion zone C below the strainer 5 and receive delignification by co-current digestion.
  • the digested black liquor obtained in this zone is extracted from the lower extraction strainer 6 at the bottom of the lower digestion zone C and sent to the recovery step through the black liquor discharge conduit 11.
  • an alkaline cooking liquor containing sodium sulfide as a main component or an alkaline cooking liquor containing sodium hydroxide as a main component and are heated by a heater 15 provided in a flow path. This circulation The liquid is supplied near the strainer 7 via the lower circulating liquid conduit 20.
  • digestion washing zone D the chips descend from the lower extraction strainer 6 toward the strainer 7, during which time the circulating digestion liquid supplied from the lower circulating fluid conduit 20 near the strainer 7 loses the lower extraction strain.
  • the digested black liquor rises toward the bottom 6 and is extracted from the lower extraction strainer 6 and sent to the recovery step through the black liquor discharge conduit 11. In this zone, the cooking reaction is completed, and pulp is obtained through the cooking pulp discharge pipe 12.
  • the temperature in the infiltration vessel E was about 120 ° C
  • the temperature at the top of the top zone A in the digester 2 was around 120 ° C
  • the temperature at the bottom of the top zone was 14 ° C. It is heated to a maximum cooking temperature in the range of 0 to 170 ° C.
  • the maximum temperature is kept within the range of 140 to 170 ° C, and in the digestion washing zone D, 140 ° is applied to the bottom of the digestion washing zone D. It decreases to around C.
  • Examples 1 to 8, 11 to 18 and Comparative Examples 1 to 2 and 9 to 11 used hardwood mixed materials, and Examples 9, 10 and Comparative Examples 3 and 4 used softwood mixed chips. It is cooked by the method of the present invention in a digester.
  • H-factor is a measure of the total amount of heat applied to the reaction system during the cooking process, and is represented by the following equation in the present invention.
  • T is the absolute temperature at a point in time
  • dt is a function of time that changes over time due to the temperature profile in the digester.
  • H-factor-1 is calculated by integrating the term on the right-hand side by the integration symbol from the time when the chips and the alkaline cooking liquor are mixed to the time when the cooking ends.
  • the pulp yield of the obtained unbleached pulp is obtained by measuring the yield of carefully selected pulp from which kashiwa has been removed.
  • Unbleached pulp kappa monovalent is TAPPI test method T 2 3 Performed according to 6 os-76. Quantification of sodium sulfide and polysulfide concentration in terms of sulfur and sulfur in the alkaline cooking liquor was performed according to TAP PI test method T 624 hm-85.
  • the pulp yield was calculated from the carbohydrate yield according to TAPPI test method T 249 hm-85 and the pulp alcohol and benzene extractables according to TAPPI test method T 2040 s-76 and the TAPPI test method T 2220 s- The acid-insoluble lignin content of the pulp performed according to 74 was added.
  • Example 1 The acid-insoluble lignin content of the pulp performed according to 74 was added.
  • Chips obtained by mixing acacia 30, oak 30, and eucalypt 40 at the absolute dry weight% were used for digestion using the continuous digester shown in FIG.
  • Total effective alkali addition rate is 1 1.9, 12.8, 13.6 wt%; was performed in three (pairs bone-dry chip N a 2 0 equivalent).
  • the first cooking liquor to be added at the top of the infiltration vessel was a polysulfide sulfa concentration of 4 gZL (equivalent to sulfur) obtained by electrochemically oxidizing an alkaline solution containing sodium hydroxide and sodium sulfide as the main components in the following electrolytic cell.
  • a second cooking liquor with 30% sulphidity was added to make 31.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • a liquid having the same composition as the second cooking liquor of 30% sulphide was added so as to have an effective capacity of 18.4% by weight based on the total amount introduced into the cooking system.
  • the electrolytic cell was configured as follows. Nickel porous material (Anode surface area per volume of anode chamber: 5600 mm, average pore diameter of mesh: 0.51 mm, surface area to diaphragm area: 28 m 2 / m 3 ), force source A two-chamber electrolytic cell composed of an iron metal and a fluororesin-based cation exchange membrane as a diaphragm was assembled.
  • Chips used for cooking total effective alkali addition rate, liquor ratio, production method of first cooking liquor, composition, amount of black liquor extracted from upper extraction strainer, temperature and time of digester, H-factor and quinone compound
  • the addition was performed in the same manner as in Example 1.
  • the first cooking liquor added at the top of the infiltration vessel was such that it contained 72% by weight of sulfur and 70% by weight of the total capacity introduced into the cooking system.
  • a second cooking liquor of 30% sulphide was added so as to be 21.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • a liquid having the same composition as the second cooking liquor having a sulfuration degree of 30% was added so as to be 8.4% by weight of an effective alkali with respect to the total amount introduced into the cooking system.
  • Table 1 shows the cooking results. According to this example, as compared with Comparative Examples 1 to 4, the pulp value at the same effective alkali addition rate was reduced, and the pulp yield at the same pulp value was increased.
  • Chips used for cooking, total effective alkali addition rate, liquid ratio, production method of first cooking liquor, composition, amount of cooking black liquor extracted from upper extraction strainer, temperature, time, H-factor and quinone compound of digester was added in the same manner as in Example 1.
  • the first cooking liquor added at the top of the infiltration vessel was such that it had a sulfur content of 100% by weight and an effective capacity of 50% by weight, based on the total amount introduced into the cooking system.
  • a second cooking liquor composed mainly of sodium hydroxide was added so as to have an effective alkali content of 31.6% by weight based on the total amount introduced into the cooking system.
  • Chips used for cooking total effective alkali addition rate, liquor ratio, production method of first cooking liquor, composition, amount of black liquor extracted from upper extraction strainer, temperature and time of digester, H-factor and quinone compound
  • the addition was performed in the same manner as in Example 1.
  • the first cooking liquor added at the top of the infiltration vessel was such that it had a sulfur content of 100% by weight and an effective capacity of 70% by weight, based on the total amount introduced into the cooking system.
  • a second cooking liquor containing sodium hydroxide as a main component was added so as to have an effective alkali content of 21.6% by weight based on the total amount introduced into the cooking system.
  • the chips used for cooking, the total effective alkali addition rate, the liquid ratio, the amount of black liquor extracted from the upper extraction strainer, the temperature and time of the digester, the addition of H-factor and quinone compounds were the same as in Example 1. went.
  • the first cooking liquor to be added at the top of the infiltration vessel was a polysulfide sulfur concentration obtained by electrochemically oxidizing an alkaline solution containing sodium hydroxide and sodium sulfide as the main components in the electrolytic cell.
  • O g ZL (terms of sulfur), an alkaline cooking liquor sodium 7 0 g ZL hydroxide (N a 2 0 equivalent) and sodium sulfide 1 1 g / L (N a 2 0 equivalent) is the main component, introduced into the cooking system 55% by weight of sulfur and 50% by weight of effective alkali were added to the total amount to be obtained.
  • a second cooking liquor of 30% sulphide was added to make 31.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • a liquid having the same composition as the second cooking liquid having a sulfuration degree of 30% was added so as to be 18.4% by weight of the effective alkali with respect to the total amount introduced into the cooking system.
  • Table 2 shows the cooking results. According to the present example, the kappa monovalent value at the same effective alkali addition rate was reduced as compared with Comparative Examples 1 to 4, Increased pulp yield at monovalent.
  • the chips used for cooking, the total effective alkali addition rate, the liquid ratio, the amount of black liquor extracted from the upper extraction strainer, the temperature and time of the digester, the addition of the H-factor and the quinone compound were the same as in Example 1.
  • the production method and composition of the first cooking liquor were the same as in Example 5.
  • the first cooking liquor added at the top of the infiltration vessel was made up to 74% by weight of sulfur and 70% by weight of effective alkali relative to the total amount introduced into the cooking system.
  • a second cooking liquor of 30% sulphide was added to give an effective alkali content of 21.6% by weight, based on the total amount introduced into the cooking system.
  • a liquid having the same composition as the second cooking liquor having a sulfuration degree of 30% was added so as to have an effective alkali of 8.4% by weight based on the total amount introduced into the cooking system.
  • Table 2 shows the cooking results. According to this example, as compared with Comparative Examples 1 to 4, kappa monovalent at the same effective alkali addition rate was reduced, and the yield of kappa at the same kappa monovalent was increased.
  • the chips used for cooking, the total effective alkali addition rate, the liquid ratio, the amount of black liquor extracted from the upper extraction strainer, the temperature and time of the digester, the addition of the H-factor and the quinone compound were the same as in Example 1.
  • the production method and composition of the first cooking liquor were the same as in Example 5.
  • the first cooking liquor added at the top of the infiltration vessel was 100% by weight sulfur and 50% by weight effective alkali relative to the total amount introduced into the digestion system.
  • a second cooking liquor composed mainly of sodium hydroxide was added so as to be 31.6% by weight of the effective alkali with respect to the total amount introduced into the cooking system.
  • the chips used for cooking, the total effective alkali addition rate, the liquid ratio, the amount of black liquor extracted from the upper extraction strainer, the temperature and time of the digester, the addition of H-factor and quinone compounds were the same as in Example 1.
  • the method and composition of the first cooking liquor were the same as in Example 5.
  • Soak First cooking liquor added at the top of the permeable vessel was set to be 1 0 0 by weight 0/0 of sulfur and 7 0% by weight of the active Al force Li based on the total amount introduced into the digester system.
  • a second cooking liquor containing sodium hydroxide as a main component was added so as to be 21.6% by weight of an effective alkali with respect to the total amount introduced into the cooking system.
  • the liquid ratio was about 3.5 LZ kg for the absolutely dry chip, including the moisture brought in by the chip.
  • a second cooking liquor of 30% sulphide was added to make 31.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • a liquid having the same composition as the second cooking liquor having a sulfidity of 30% was added so as to be 18.4% by weight of an effective alkali with respect to the total amount introduced into the digestion system.
  • 1,4,4a, 9a-Tetrahydroanthraquinone as a quinone compound was mixed with the first cooking liquor to be added in a 0.05% by weight permeation vessel to the absolutely dry chips.
  • the temperature is kept at 120 ° C for 30 minutes, and in the top zone, the temperature is raised from 120 ° C to 140 ° C in the top zone from the top to the bottom in 30 minutes.
  • the temperature was maintained at 156 ° C. for 50 minutes, in the digestion washing zone, the temperature was maintained at 156 ° C. for 160 minutes, and in the digestion washing zone, 1 min.
  • the temperature was lowered from 56 ° C to 140 ° C in 170 minutes, and the digestion was carried out to H-factor of 1400.
  • Table 4 shows the cooking results. According to this example, compared with Comparative Examples 5 to 8, the kappa monovalent value at the same effective alkali addition rate was reduced, and the pulp yield at the same power value was increased.
  • Example 10 shows the cooking results. According to this example, compared with Comparative Examples 5 to 8, the kappa monovalent value at the same effective alkali addition rate was reduced, and the pulp yield at the same power value was increased.
  • Chips used for digestion total effective alkali addition rate, liquid ratio and digester temperature, time,
  • the addition of the H-factor and the quinone compound was the same as in Example 9, the amount of the cooking black liquor extracted from the upper extraction strainer was the same as in Example 1, and the production method and composition of the first cooking liquor were as in Example 5. The same was done.
  • the first cooking liquor added at the top of the permeation vessel was added so as to have a sulfur content of 100% by weight and an effective energy of 50% by weight based on the total amount introduced into the cooking system.
  • a second cooking liquor composed mainly of sodium hydroxide was added so as to be 31.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • Chips used for cooking, total effective alkali addition rate, liquid ratio, method of preparing first cooking liquor, composition, amount of black liquor extracted from upper extraction strainer, temperature and time of digester One was performed in the same manner as in Example 1.
  • the quinone compound, 1, 4, 4 a, 9 a - mixed to 0 Tetorahi mud anthraquinone against the bone-dry chip 0 3 second cooking liquor added weight 0/0 by cooking zone Ichin bottom. was.
  • the first cooking liquor added at the top of the infiltration vessel was such that the total sulfur introduced into the cooking system was 53% by weight of sulfur and 50% by weight of effective aluminum.
  • a second cooking liquor of 30% sulphide was added to make 31.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • a liquid having the same composition as the second cooking liquid having a sulfuration degree of 30% was added so as to be 18.4% by weight of an effective alkali with respect to the total amount introduced into the cooking system.
  • Table 6 shows the cooking results. According to this example, compared to Comparative Examples 2 and 9 to 11, kappa monovalent was reduced at the same effective alkali addition rate and pulp yield was increased at the same potter value o
  • Chips used for cooking total effective alkali addition rate, liquor ratio, production method of first cooking liquor, composition, amount of cooking black liquor extracted from upper extraction strainer, temperature, time and H-factor of digester
  • 9a-tetrahide anthraquinone as a quinone compound was added to the absolutely dry chip at the top of a 0.03% by weight permeation vessel. It was mixed into the first cooking liquor.
  • the first cooking liquor added at the top of the infiltration vessel was such that it contained 72% by weight of sulfur and 70% by weight of the total volume introduced into the cooking system.
  • a second cooking liquor of 30% sulphide was added to make 21.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • a solution having the same composition as the second digestion solution having a sulfuration degree of 30% was added so as to be 8.4% by weight of the effective alkali with respect to the total amount introduced into the digestion system.
  • the digestion results are shown in Table 6. According to this example, as compared with Comparative Examples 2 and 9 to 11, the pulp number at the same effective alkali addition rate was reduced, and the pulp yield at the same lip number was increased.
  • the chips used for cooking, total effective alkali addition rate, liquor ratio, production method and composition of the first cooking liquor, amount of cooking black liquor extracted from the upper extraction strainer, temperature, time and H-fatter of the digester are as follows: In the same manner as in Example 1, the quinone compound was added in the same manner as in Example 11. The first cooking liquor added at the top of the osmotic vessel was 100% by weight sulfur and 50% by weight effective alkali relative to the total amount introduced into the cooking system. At the bottom of the upper cooking zone, a second cooking liquor composed mainly of sodium hydroxide was added so as to have an effective alkali content of 31.6% by weight based on the total amount introduced into the cooking system.
  • the chips used for cooking, total effective alkali addition rate, liquor ratio, method and composition of the first cooking liquor, amount of black liquor extracted from the upper extraction strainer, digester temperature, time and H-factor were implemented.
  • the addition of the quinone compound was performed as in Example 11.
  • the first cooking liquor added at the top of the osmotic vessel was 100% by weight sulfur and 70% by weight effective alkali relative to the total amount introduced into the cooking system.
  • a second cooking liquor composed mainly of sodium hydroxide is added to the total amount introduced into the cooking system. It was added so as to have an effective alkali content of 21.6% by weight.
  • the chips used in the digestion, the total effective alkali addition rate, the liquor ratio, the amount of the digested black liquor extracted from the upper extraction strainer, the temperature, time and H-factor of the digester were the same as in Example 1, and the first digestion was carried out.
  • the production method and composition of the liquid were the same as in Example 5, and the addition of the quinone compound was performed as in Example 11.
  • the first cooking liquor added at the top of the permeation vessel was added so as to have a sulfur content of 55% by weight and an effective energy of 50% by weight based on the total amount introduced.
  • a second cooking liquor of 30% sulphide was added to make 31.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • a liquid having the same composition as the second cooking liquor having a sulfidity of 30% was added so as to be 18.4% by weight of an effective alkali with respect to the total amount introduced into the cooking system.
  • Table 7 shows the cooking results. According to this example, as compared with Comparative Examples 2 and 9 to 11, the monovalent value of copper at the same effective alkali addition rate was reduced, and the pulp yield at the same monovalent value of saliva was increased.
  • the chips used in the digestion, the total effective alkali addition rate, the liquor ratio, the amount of the digested black liquor extracted from the upper extraction strainer, the temperature, time and H-factor of the digester were the same as in Example 1, and the first digestion was carried out.
  • the production method and composition of the liquid were the same as in Example 5, and the addition of the quinone compound was performed as in Example 11.
  • the first cooking liquor added at the top of the infiltration vessel was such that it contained 74% by weight of sulfur and 70% by weight of the total amount introduced into the cooking system.
  • a second cooking liquor of 30% sulphide was added to give an effective alkali content of 21.6% by weight, based on the total amount introduced into the cooking system.
  • the chips used for the digestion, the total effective alkali addition rate, the liquor ratio, the amount of the digested black liquor extracted from the upper extraction strainer, the temperature and time of the digester, and the ⁇ ⁇ ⁇ ⁇ -factor were the same as in Example 1.
  • the production method and composition of the liquid were the same as in Example 5, and the addition of the quinone compound was performed as in Example 11.
  • the first cooking liquor added at the top of the infiltration vessel was such that 100% by weight of sulfur and 50% by weight of the effective amount were based on the total amount introduced into the cooking system.
  • a second cooking liquor consisting mainly of sodium hydroxide was added to make the effective alkali 31.6% by weight based on the total amount introduced into the cooking system.
  • the chips used for the digestion, the total effective alkali addition rate, the liquor ratio, the amount of the digested black liquor extracted from the upper extraction strainer, the temperature and time of the digester, and the ⁇ ⁇ ⁇ ⁇ -factor were the same as in Example 1.
  • the production method and composition of the liquid were the same as in Example 5, and the addition of the quinone compound was performed as in Example 11.
  • the first cooking liquor added at the top of the infiltration vessel was such that it had a sulfur content of 100% by weight and an effective capacity of 70% by weight, based on the total amount introduced into the cooking system.
  • a second cooking liquor composed mainly of sodium hydroxide was added so as to be 21.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • a liquid having the same composition as the second cooking liquor was added so as to have an effective alkali content of 8.4% by weight based on the total amount introduced into the cooking system.
  • Table 7 shows the cooking results. According to this example, as compared with Comparative Examples 2 and 9 to 11, the monovalent value of copper at the same effective alkali addition rate was reduced, and the pulp yield at the same strength value of pulp was increased.
  • the chips used for the cooking and the total effective alkali addition rate were the same as in Example 1.
  • the digester used a 2.5-liter autoclave that turned upside down in an air bath where an arbitrary temperature profile could be set.
  • This device has a valve that can extract liquid in the autoclave and a valve that can inject liquid from outside into the autoclave.
  • Cooking Explaining the temperature profile, the digestion starts at room temperature, rises to 140 ° C in 30 minutes, then to 160 ° C over 60 minutes, and then 250 minutes and 160 ° C. It was kept at C and cooked to H-factor of 1400.
  • an alkaline solution mainly containing sodium hydroxide and sodium sulfide was introduced into the electrolytic cell, and the sodium sulfide in the alkaline solution was electrochemically oxidized.
  • obtained was poly Sarufai Dosarufa concentration 4 GZL (terms of sulfur), the first alkaline sodium concentration 70 GZL hydroxide (N a 2 0 equivalent) and sodium sulfide concentration 22. 6 gZL (N a 2 0 equivalent) is the main component
  • the cooking liquor was added so as to have a sulfur content of 53% by weight and an effective alkali content of 50% by weight based on the total amount introduced into the cooking system, and heating was started.
  • the liquid ratio was adjusted to 2.5 LZkg with respect to the absolutely dry chips by combining with the moisture brought in by the chips.
  • the temperature reached 140 ° C in 30 minutes after the start of the temperature rise, 45% by volume of the whole digested black liquor was extracted from the autoclave.
  • a second cooking liquor having a sulfide degree of 30% which has been heated to 90 ° C in advance, is heated in a digester with 31.6% by weight of an effective alkali with respect to the total amount introduced into the digester. It was added so that the liquid ratio became 2.5 L / kg.
  • the chips used for the cooking and the total effective alkali addition rate were the same as in Example 1, and the cooking equipment, the method for preparing the first cooking liquor, the composition, the cooking temperature and time, the addition of the H-factor and the quinone compound were the same as in Example 1. Performed in the same manner as 9.
  • the first cooking liquor was added together with chips at room temperature so as to be 72% by weight of sulfur and 70% by weight of effective alkali with respect to the total amount introduced into the cooking system, and the temperature was raised.
  • the liquid ratio was adjusted to 2.5 LZkg with respect to the absolutely dry chips, in accordance with the water content brought into the chips.
  • the chips used for the cooking, the total effective alkali addition rate were the same as in Example 1, and the cooking equipment, the preparation method of the first cooking liquor, the composition, the cooking temperature and time, the addition of the H-factor and the quinone compound were the same as in Example 1.
  • the first cooking liquor is added together with the chips at room temperature so as to be 100% by weight of sulfur and 50% by weight of effective alkali with respect to the total amount introduced into the cooking system, and heating is started. did.
  • the liquid ratio was adjusted to 2.5 LZkg with respect to the absolutely dry chips by combining the water content brought into the chips. When the temperature reached 140 ° C.
  • the chips used for the cooking, the total effective alkali addition rate were the same as in Example 1, and the cooking equipment, the preparation method of the first cooking liquor, the composition, the cooking temperature and time, the addition of the H-factor and the quinone compound were the same as in Example 1. Performed in a similar manner to 19. At the start of cooking, at room temperature, the first cooking liquor was added together with the chips so as to have a sulfur content of 100% by weight and an effective amount of 70% by weight based on the total amount introduced into the cooking system, and the temperature was raised. Started. At that time, the liquid ratio was adjusted to 2.5 LZkg with respect to the absolutely dry chips by combining the water content brought into the chips.
  • the chips used for the digestion and the total effective alkali addition rate were the same as in Example 1, and the digester, the temperature and time of the digestion, the addition of the H-factor and the quinone compound were performed as in Example 19.
  • the chips used for cooking and the total effective alkali addition rate were the same as in Example 1.
  • the digester used an autoclave with a 2.5-L capacity that rotated upside down in an air bath in which an arbitrary temperature profile could be set. This device has a valve that can extract liquid in the autoclave and a valve that can inject liquid from outside into the autoclave.
  • start cooking from room temperature raise the temperature to 140 ° C in 30 minutes, then increase to 160 ° C in 60 minutes, and then increase the temperature to 160 ° C in 250 minutes.
  • a second cooking liquor of 30% sulphide which has been preheated to 90 ° C, is added to the digester with 31.6% by weight of an effective alkali in the digester. It was added so that the liquid ratio became 2.5 LZkg.
  • the quinone compound 1,4,4a, 9a-tetrahydroanthraquinone was mixed with the second cooking liquor in an amount of 0.05% by weight based on the dry chips. Table 10 shows the results of the cooking. According to this example, as compared with Comparative Examples 16 to 19, the pulp number at the same effective power addition rate was reduced, and the pulp yield at the same power value was increased.
  • the chips used for the cooking, the total effective alkali addition rate were the same as in Example 1, and the cooking equipment, the cooking temperature, time, the H-factor and the addition of the quinone compound were the same as in Example 19, and The preparation and composition of the cooking liquor were performed in the same manner as in Example 23.
  • the first cooking liquor is added together with the chips at room temperature to a concentration of 74% by weight of sulfur and 70% by weight of the effective alkali with respect to the total amount introduced into the cooking system. Warm was started.
  • the liquid ratio was adjusted to 2.5 L / kg with respect to the absolutely dry chips by combining the water brought in with the chips. When the temperature reached 140 ° C.
  • the chips used for the cooking, the total effective alkali addition rate were the same as in Example 1, and the cooking equipment, the cooking temperature, time, H_factor and the addition of the quinone compound were the same as in Example 19, and The preparation and composition of the cooking liquor were performed in the same manner as in Example 23.
  • the first cooking liquor is added together with the chips at room temperature so as to have a sulfur content of 100% by weight and an effective alkali content of 50% by weight based on the total amount introduced into the cooking system. Warm was started. That At this time, the liquid ratio was adjusted to 2.5 LZkg with respect to the absolutely dry chips by combining with the moisture brought in by the chips. When the temperature reached 140 ° C.
  • the chips used for the digestion and the total effective alkali addition rate were the same as in Example 1, and the digester, the temperature and time of the digestion, the addition of the H-factor and the quinone compound were the same as in Example 19, and the first digestion was performed.
  • the production method and composition of the liquid were the same as in Example 23.
  • the first cooking liquor is added together with the chips so as to have a sulfur content of 100% by weight and an effective alkali of 70% by weight with respect to the total amount introduced into the cooking system. Started.
  • the liquid ratio was adjusted to 2.5 LZkg with respect to the absolutely dry chips by combining the moisture brought in with the chips. When the temperature reached 140 ° C.
  • the chips used for cooking total effective alkali addition rate, liquid ratio, amount of cooking black liquor extracted from the upper extraction strainer, temperature and time of the digester, addition of H-factor and quinone compound This was performed in the same manner as in Example 1.
  • the first cooking liquor to be added at the top of the infiltration vessel was a polysulfide sulfur concentration of 4 g obtained by previously dissolving sulfur in an alkaline solution containing sodium hydroxide and sodium sulfide at 70 ° C.
  • an alkaline cooking liquor sodium hydroxide concentration 7 0 g / L (N a 2 0 equivalent) and sodium sulfide concentration 30 g / L (N a 2 0 equivalent) is the main component, the cooking system It was added so as to have a sulfur content of 56% by weight and an effective capacity of 50% by weight, based on the total amount introduced. At that time, the liquid ratio was adjusted to approximately 3.5 LZkg with respect to the absolutely dry chips, in combination with the moisture brought in by the chips. From the upper extraction strainer, 45% by volume of the total digested black liquor was extracted.
  • a second cooking liquor of 30% sulphide was added to make 31.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • a liquid having the same composition as the second cooking liquor with 30% sulphide was added so as to be 18.4% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • Table 12 shows the results of the digestion. According to this example, as compared with Comparative Examples 16 to 19, the kappa monovalent value at the same effective alkali addition rate was reduced, and the pulp yield at the same power value was increased.
  • the chips used for cooking, the total effective alkali addition rate, the liquid ratio, the amount of black liquor extracted from the upper extraction strainer, the temperature and time of the digester, the H-factor and the addition of the quinone compound were the same as in Example 1. I went. As the first cooking liquor to be added at the top of the permeation vessel, a polysulfide sulfur concentration obtained by previously dissolving sulfur in an alkaline solution containing sodium hydroxide and sodium sulfide as main components at 70 ° C. was used.
  • GZL sulfur conversion calculation
  • the total amount of the sodium concentration 70 GZL hydroxide (N a 2 ⁇ equivalent) and sodium sulfide concentration 3 0 g / (N a 2 0 equivalent) is introduced an alkaline cooking liquor of the main component in the cooking system
  • the upper part cooking zone, sodium hydroxide the second cooking liquor of the main component was added to a 3 1.6 wt 0/0 effective alkali content of the total amount that will be introduced into the cooking system.
  • Chips used for cooking total effective alkali addition rate, liquid ratio, method and composition of first cooking liquor
  • the temperature, time, H-factor and quinone compound of the digester were added in the same manner as in Example 1.
  • the first cooking liquor added at the top of the infiltration vessel was added so as to have a sulfur content of 53% by weight and an effective alkali of 50% by weight based on the total amount introduced into the cooking system.
  • From the upper extraction strainer 15% by volume of the whole digested black liquor was extracted.
  • a second cooking liquor of 30% sulphidity is added to the total amount introduced into the cooking system by 3%.
  • Chips used for cooking total effective alkali addition rate, liquor ratio, production method of first cooking liquor, composition, amount of cooking black liquor extracted from upper extraction strainer, digester temperature, time and H-fat Performed as in Example 1.
  • the first cooking liquor added at the top of the infiltration vessel was added so as to have a sulfur content of 53% by weight and an effective energy of 50% by weight based on the total amount introduced into the cooking system.
  • a second cooking liquor with a degree of sulphidation of 3096 was added so as to be 31.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • Chips used for cooking, total effective alkali addition rate, liquid ratio, production method of first cooking liquor, composition, amount of cooking black liquor extracted from upper extraction strainer, temperature, time, H-factor and quinone compound of digester was added in the same manner as in Example 1.
  • the first cooking liquor, added at the top of the infiltration vessel was added so as to be 82% by weight of sulfur and 80% by weight of effective alkali relative to the total amount introduced into the cooking system.
  • a second cooking liquor of 30% sulphide was added to make 16.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • the same set as the second cooking liquor with 30% sulfur The resulting liquor was added to an effective alkali content of 3.4% by weight based on the total amount introduced into the digestion system. Table 3 shows the cooking results.
  • Chips used for cooking total effective alkali addition rate, liquor ratio, method of preparing first cooking liquor, composition, amount of black liquor extracted from upper extraction strainer, temperature, time, H-factor-1 and quinone of digester
  • the compound was added in the same manner as in Example 1.
  • the first cooking liquor which was added at the top of the osmotic vessel, was added so as to have a sulfur content of 32% by weight and an effective energy of 30% by weight based on the total amount introduced into the cooking system.
  • a second cooking liquor of 30% sulphide was added so as to be 41.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • the chips used for cooking, total effective alkali addition rate, liquid ratio, digester temperature, time, addition of H-factor and quinone compound were the same as in Example 9, and the preparation and composition of the first cooking liquor were carried out.
  • the first cooking liquor, added at the top of the permeation vessel, was added so as to have a sulfur content of 53% by weight and an effective alkali of 50% by weight, based on the total amount introduced into the cooking system.
  • From the upper extraction strainer 15% by volume of the whole digested black liquor was extracted.
  • a second cooking liquor of 30% sulphide was added to make 31.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • a liquid having the same composition as the second cooking liquor of 30% sulphide was added so that it became 18.4% by weight of effective alkali with respect to the total amount introduced into the cooking system. did.
  • Table 5 shows the cooking results.
  • the chips used for the digestion, the total effective alkali addition rate, the liquor ratio, the amount of the digested black liquor extracted from the upper extraction strainer, the temperature and time of the digester, and the H-factor were the same as in Example 9, except for the first digestion.
  • the production method and composition of the liquid were the same as in Example 1.
  • the first cooking liquor, which was added at the top of the permeation vessel, was added so as to have a sulfur content of 53% by weight and an effective energy of 50% by weight based on the total amount introduced into the cooking system.
  • 30% sulphide at the bottom of the upper cooking zone Of the second cooking liquor was added so as to be 31.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • the chips used for cooking, the total effective alkali addition rate, the liquid ratio, the amount of black liquor extracted from the upper extraction strainer, the temperature and time of the digester, the addition of the H-factor and the quinone compound were the same as in Example 9,
  • the production method and composition of the first cooking liquor were performed in the same manner as in Example 1.
  • the first cooking liquor, which was added at the top of the infiltration vessel, was added so as to have a sulfur content of 82% by weight and an effective energy of 80% by weight based on the total amount introduced into the cooking system.
  • a second cooking liquor having a sulfuration degree of 30% was added so as to be 16.6% by weight of an effective alkali with respect to the total amount introduced into the cooking system.
  • the chips used for cooking, the total effective alkali addition rate, the liquid ratio, the amount of black liquor extracted from the upper extraction strainer, the temperature and time of the digester, the addition of the H-factor and the quinone compound were the same as in Example 9,
  • the production method and composition of the first cooking liquor were performed in the same manner as in Example 1.
  • the first cooking liquor added at the top of the infiltration vessel was added so as to be 32% by weight sulfur and 30% by weight effective alkali relative to the total amount introduced into the cooking system.
  • a second cooking liquor having a sulfuration degree of 30% was added so as to be 41.6% by weight of an effective alkali with respect to the total amount introduced into the cooking system.
  • a liquid having the same composition as the second cooking liquor of 30% sulphide was added so as to have an effective amount of 28.4% by weight based on the total amount introduced into the cooking system.
  • Table 5 shows the cooking results.
  • the chips used for cooking, the total effective alkali addition rate, the liquid ratio, the method for preparing the first cooking liquor, the composition, the temperature, time and H-factor of the digester were the same as in Example 1, and the quinone compound was added.
  • the procedure was performed in the same manner as in Example 11.
  • the first cooking liquor, added at the top of the infiltration vessel contained 53% by weight of sulfur and 50% by weight of active I made it into potash. From the upper extraction strainer, 15% by volume of the total digested black liquor was extracted. At the bottom of the upper cooking zone, a second cooking liquor with 30% sulphide was added to make 21.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • the chips used for cooking, the total effective alkali addition rate, the liquid ratio, the method for preparing the first cooking liquor, the composition, the temperature, time and H-factor of the digester were the same as in Example 1, and the quinone compound was added.
  • the procedure was performed in the same manner as in Example 11.
  • the first cooking liquor, added at the top of the infiltration vessel was added so as to have a sulfur content of 82% by weight and an effective alkalinity of 80% by weight, based on the total amount introduced into the cooking system.
  • a second cooking liquor with a sulfuration degree of 30% was added so as to be 16.6% by weight of an effective alkali with respect to the total amount introduced into the cooking system.
  • the chips used for cooking, the total effective alkali addition rate, the liquid ratio, the method for preparing the first cooking liquor, the composition, the temperature, time and H-factor of the digester were the same as in Example 1, and the quinone compound was added.
  • the procedure was performed in the same manner as in Example 11.
  • the first cooking liquor, which was added at the top of the permeation vessel, was added so as to have a sulfur content of 32% by weight and an effective alkali of 30% by weight based on the total amount introduced into the cooking system.
  • a second cooking liquor of 30% sulphide was added so as to be 41.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • the chips used for cooking, the total effective alkali addition rate were as in Example 1, using the digester, the method for preparing the first cooking liquor, the composition, the cooking temperature, the time, the H-factor and the quinone compounds.
  • the addition was performed in the same manner as in Example 19.
  • the first cooking liquor was added together with chips at room temperature so that the sulfur content was 53% by weight and the effective alkali was 50% by weight based on the total amount introduced into the cooking system, and the temperature was raised. did.
  • the liquid ratio was adjusted to 2.5 L kg with respect to the absolutely dry chips, together with the moisture brought in by the chips.
  • the temperature reached 140 at 30 minutes after the start of heating 45% by volume of the whole digested black liquor was extracted from the autoclave.
  • the second cooking liquor of 30% sulphide which has been preheated to 90 ° C, is treated with 31.6% by weight of effective alkali in the digester based on the total amount introduced into the cooking system.
  • the chips used for cooking and the total effective alkali addition rate were the same as in Example 1, except for the digester,
  • the preparation method, composition, cooking temperature, time, and H-factor of the cooking liquor of 1 were performed in the same manner as in Example 19.
  • the first cooking liquor was added together with the chips at room temperature so that the sulfur content was 53% by weight and the effective alkali was 50% by weight based on the total amount introduced into the cooking system, and the temperature was raised. did.
  • the liquid ratio was adjusted to 2.5 LZkg with respect to the absolutely dry chips by combining with the moisture brought in by the chips.
  • the temperature reached 140 ° C. in 30 minutes after the start of heating 45% by volume of the whole digested black liquor was extracted from the autoclave.
  • a second cooking liquor of 30% sulphide, previously heated to 90 ° C, is heated to 31.6% by weight of the effective alkali in the digester with respect to the total amount introduced into the cooking system. It was added so that the ratio became 2.5 L / kg. Further, at 240 minutes after the start of the digestion, the sulphide with a sulfuration degree of 30%, which had been heated to 90 ° C in advance, was used.
  • a liquid having the same composition as the cooking liquor of No. 2 was added so as to be 18.4% by weight of an effective alkali with respect to the total amount introduced into the cooking system.
  • the quinone compound was added without addition. Table 1 shows the cooking results
  • the chips used for the cooking and the total effective alkali addition rate were the same as in Example 1, except that the cooking equipment, the method for preparing the first cooking liquor, the composition, the cooking temperature and time, the addition of the H-factor and the quinone compound were implemented.
  • the procedure was as in Example 19.
  • the cooking liquor was added so as to have a sulfur content of 83% by weight and an effective alkali of 80% by weight based on the total amount introduced into the cooking system, and the temperature was raised.
  • the liquid ratio was adjusted to 2.5 LZkg with respect to the absolutely dry chips by combining the moisture brought in with the chips. When the temperature reached 140 ° C.
  • the chips used for the cooking and the total effective alkali addition rate were the same as in Example 1, and the cooking equipment, the preparation method of the first cooking liquor, the composition, the cooking temperature and time, the addition of the H-factor and the quinone compound were the same as in Example 1. Performed in a similar manner to 19. At the start of cooking, the first cooking liquor was added together with the chips at room temperature so that the sulfur content was 32% by weight and the effective alkali was 30% by weight based on the total amount introduced into the cooking system, and the temperature was raised. did. At that time, the liquid ratio was adjusted to 2. S LZkg for the absolutely dry chips by combining the moisture brought in with the chips. When the temperature reached 140 ° C.
  • the chips used for cooking, total effective alkali addition rate, liquid ratio, digester temperature, time, H-factor and addition of quinone compound were the same as in Example 1, and the production method and composition of the first cooking liquid were the same as in Example 1.
  • the first cooking liquor added at the top of the permeation vessel was such that 56% by weight of sulfur and 50% by weight of available alkali were based on the total amount introduced into the cooking system. From the upper extraction strainer, 15% by volume of the total Extracted. In the upper cooking zone, a second cooking liquor with a sulphidity of 30% was added to make up 21.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • the chips, total effective alkali addition rate, liquid ratio, digester temperature, time and H-factor used in the cooking were the same as in Example 1, and the production method and composition of the first cooking liquor were the same as in Example 27. I went.
  • the first cooking liquor added at the top of the permeation vessel was added so as to have a sulfur content of 56% by weight and an effective energy of 50% by weight based on the total amount introduced into the cooking system.
  • a second cooking liquor with a sulphidity of 30% was added so as to be 11.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • the quinone compound was added without addition. Table 13 shows the results of the digestion.
  • the chips used for cooking, total effective alkali addition rate, liquid ratio, digester temperature, time, H-factor and quinone compound addition were the same as in Example 1, and the method and composition of the first cooking liquor were the same as in Example 1.
  • the first cooking liquor, added at the top of the permeation vessel, was added so as to have a sulfur content of 83% by weight and an effective alkali content of 80% by weight, based on the total amount introduced into the cooking system.
  • a second cooking liquor with a sulphidity of 30% was added to make up 16.6% by weight of effective alkali with respect to the total amount introduced into the cooking system.
  • a liquid having the same composition as the second cooking liquor having a sulfidity of 30% was added so as to have an effective alkali content of 3.4% by weight based on the total amount introduced into the cooking system.
  • the chips used for cooking, total effective alkali addition rate, liquid ratio, digester temperature, time, H-factor and quinone compound addition were the same as in Example 1, and the method and composition of the first cooking liquor were the same as in Example 1. Performed similarly to 27.
  • the first cooking liquor which is added at the top of the infiltration vessel, contains 46% by weight of sulfur and 30% by weight of active It was added so as to become potash.
  • Wood chips Hardwood mixed material I Hardwood mixed material Wide green tree mixed material Wide mixed material Total effective alkali addition rate (vs. dry copper 7F 'overlap) (: as Na20) 11.9 12.8 13.6 1 11.9 12.8 13.6 11.9 12.8 13.6 11.9 12.8 13.6 11.9 12.8 13.6 11.9 12.8 13.6 11.9 12.8 13.6 Addition, extraction bottle place L
  • Example 'Comparative Example NO.B Ratio ⁇ Example 5 m Ratio ⁇ 7 Ratio Tree ⁇ Chip Note Mixing Material Rising Mixing Material Needle Leaf Material Harbour Tree Mixing Material All Effective Al or J Addition Rate (Na20) 45 16.5 18.5 14.5 1 16.5 18.5 14.5 1 16.5 16.5! 4.5 16.5 18.5 Addition
  • Effective Al splitting ratio to total S input to cooking system (weight X) 18.4 1B.4 3.4 28.4
  • Example 6 Example No. Example 1 Example 12 Example 13 Example 14
  • Wood chips HIROKI difficult mixture I HIROSHI mixture 1 HIROKI SHIMI mixture 1 ⁇ ; Foliage mixture Total effective alkali addition rate (vs. Zi-ku Chikufu's heavy iX: as Na20) 11.9 12.6, 3.6 I 11.9 12 ⁇ 13.6 H 11.9 12.8 13.6 1 11.9 12.8 13.6 Addition, extraction well 1
  • Total il to be digested to the cooking system ratio of effective al addition to total il (multiple ⁇ ) 18.4 18.4 3.4 28.4
  • the pulp yield can be further improved, and the relationship between kappa monovalent and pulp yield can be further improved. That is, the present invention can reduce the kappa value at the same effective alkali addition rate and can improve the pulp yield at the same strength of the brim.

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Abstract

L'invention concerne un procédé continu de digestion de matière lignocellulosique dans un dispositif de digestion à deux récipients: un récipient de perméation est placé avant un récipient de digestion, lequel comprend de haut en bas une zone surélevée, une zone de digestion supérieure et une zone de digestion inférieure. Chaque zone comporte dans sa partie basse un tamis, et une liqueur de digestion noire extraite s'évacue depuis au moins un tamis vers l'extérieur du système de digestion. On utilise des copeaux d'arbre à feuilles caduques ou de conifère, puis on ajoute un liquide de digestion alcalin au sommet du récipient de perméation. Ce liquide renferme du souffre type polysulfure selon une concentration comprise entre 3 et 20 g/l en tant que souffre, puis du souffre selon une quantité comprise entre 45 et 100 %, en poids, et un alcali efficace selon une quantité comprise entre 45 et 79 %, en poids, ces deux pourcentages étant établis par rapport aux quantités respectives totales présentes dans le liquide de digestion alcalin injecté dans le système de digestion. Par ailleurs, un liquide de digestion alcalin renfermant une quantité spécifique de composé de quinone par poids de copeau absolument séché est introduit dans le récipient de perméation ou dans la zone de digestion supérieure au niveau de sa partie basse. On peut utiliser le procédé considéré pour abaisser la valeur kappa par rapport au même pourcentage d'adjonction d'alcali efficace ainsi que pour améliorer le rendement en pulpe par rapport à la même valeur kappa.
PCT/JP2000/003402 1999-05-28 2000-05-26 Procede de digestion de matiere lignocellulosique Ceased WO2000073572A1 (fr)

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AU47814/00A AU4781400A (en) 1999-05-28 2000-05-26 Process for digesting lignocellulose material

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JP15078299A JP4298059B2 (ja) 1999-05-28 1999-05-28 リグノセルロース材料の蒸解法
JP11/150782 1999-05-28

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EP2436837A4 (fr) * 2009-05-26 2014-05-14 Jujo Paper Co Ltd Procédé pour lessiver un matériau lignocellulosique

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US20070240837A1 (en) * 2006-04-13 2007-10-18 Andritz Inc. Hardwood alkaline pulping processes and systems
JP2009209473A (ja) * 2008-03-03 2009-09-17 Omikenshi Co Ltd 非木材再生セルロース繊維及び該繊維含有繊維製品
US9580864B2 (en) 2011-08-30 2017-02-28 Valmet Ab Kraft cooking method using polysulfide cooking liquor
CN103827388B (zh) * 2011-08-30 2016-09-21 维美德公司 使用多硫化物蒸煮液的硫酸盐蒸煮方法
CN104099792B (zh) * 2014-06-27 2016-09-07 刘建国 造纸制浆用蒸煮助剂
CA2959305C (fr) * 2014-08-26 2021-06-15 Valmet Ab Procede rentable de cuisson de kraft a l'aide d'une liqueur de cuisson au polysulfure

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JPH05247864A (ja) * 1992-02-28 1993-09-24 Oji Paper Co Ltd セルロースパルプの漂白法
JPH07189153A (ja) * 1993-12-28 1995-07-25 Kawasaki Kasei Chem Ltd リグノセルロース材料の蒸解法
WO1997041295A1 (fr) * 1996-04-26 1997-11-06 Asahi Glass Company Ltd. Procede de production de polysulfures par oxydation electrolytique

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
JPH05247864A (ja) * 1992-02-28 1993-09-24 Oji Paper Co Ltd セルロースパルプの漂白法
JPH07189153A (ja) * 1993-12-28 1995-07-25 Kawasaki Kasei Chem Ltd リグノセルロース材料の蒸解法
WO1997041295A1 (fr) * 1996-04-26 1997-11-06 Asahi Glass Company Ltd. Procede de production de polysulfures par oxydation electrolytique

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2436837A4 (fr) * 2009-05-26 2014-05-14 Jujo Paper Co Ltd Procédé pour lessiver un matériau lignocellulosique

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