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WO2013095266A1 - Procédé d'augmentation de l'efficacité d'un raffinage en pile d'une pâte chimique - Google Patents

Procédé d'augmentation de l'efficacité d'un raffinage en pile d'une pâte chimique Download PDF

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Publication number
WO2013095266A1
WO2013095266A1 PCT/SE2012/051387 SE2012051387W WO2013095266A1 WO 2013095266 A1 WO2013095266 A1 WO 2013095266A1 SE 2012051387 W SE2012051387 W SE 2012051387W WO 2013095266 A1 WO2013095266 A1 WO 2013095266A1
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Prior art keywords
lignosulfonate
beating
pulp
chemical pulp
paper product
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PCT/SE2012/051387
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English (en)
Inventor
Francois Lambert
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Domsjoe Fabriker AB
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Domsjoe Fabriker AB
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Application filed by Domsjoe Fabriker AB filed Critical Domsjoe Fabriker AB
Publication of WO2013095266A1 publication Critical patent/WO2013095266A1/fr
Anticipated expiration legal-status Critical
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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
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • 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
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/005—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives organic compounds
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07G—COMPOUNDS OF UNKNOWN CONSTITUTION
    • C07G1/00—Lignin; Lignin derivatives
    • 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
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/007—Modification of pulp properties by mechanical or physical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/02—Methods of beating; Beaters of the Hollander type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/10—Mixtures of chemical and mechanical pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/23—Lignins

Definitions

  • the present invention relates to the field of paper making, in particular it relates to an energy efficient method of beating a chemical pulp.
  • Wood is composed of cellulose, hemicellulose, lignin and extractives and is the most common raw material in papermaking.
  • a paper making process includes debarking and chipping of logs followed by a chemical or mechanical pulping process.
  • Chemical pulping can be an acidic process, such as the sulfite process or an alkaline process, such as the sulfate process (Kraft process).
  • Kraft process wood chips are cooked in a mix of sodium hydroxide and sodium sulfide. Prior to cooking, the chips are normally first wetted and preheated with steam. This step is followed by a step of impregnation of the chips with black and white liquor,
  • the chips are thereafter cooked in a digester for several hours, at a temperature between 130 °C to 180 °C, and during this process lignin and some hemicellulose is degraded and dissolved in the cooking liquid.
  • the remaining cellulose fibers are blown or squeezed from the outlet of the digester through an airlock.
  • the swift change in pressure results in a sudden expansion of the fibers, which leads to a further separation of the fibers.
  • the resulting fiber suspension in water solution is called "brown stock" due to its brown color.
  • the brown stock is thereafter washed in a series of brown stock washers, in order to remove degraded lignin and hemicellulose, as well as other contaminates such as spent cooking chemicals.
  • the extracted liquid is called black liquor. Sodium and sulfur compounds from the black liquor is recovered and recycled in the process and the remains are burned to produce energy.
  • the extracted liquid is called red liquor, brown liquor or spent sulfite liquor. Lignosulfonate is a valuable product which can be recovered from the spent sulfite liquor.
  • a clean pulp is obtained and depending of the intended use of the paper, the clean pulp can optionally be bleached.
  • the pulp is next put through a mechanical rubbing action called beating, which increases the bonding ability of the fibers so that most of the strength properties of the produced paper will be improved. Different fillers and other additives is thereafter added to the beated pulp to produce a furnish.
  • the additives can for example improve different characteristics of the paper and the filler can be added to reduce the amount of fibers in the paper which will reduce the costs.
  • the furnish is finally fed or pumped into a paper machine.
  • the paper machine typically consists of forming, press and dryer section. In the forming section the furnish is dewatered to form a paper web. After the forming section the web enters the press section, the dewatering continues by pressing the web under load. Finally the paper is dried in the dryer section, using steam
  • Cellulose fibers present in a chemical pulp such as a sulfate pulp or a sulfite pulp are typically straight, smooth, rounded and largely undamaged. These characteristics make the bonding between the fibers fairly weak.
  • a chemical pulp such as a sulfate pulp or a sulfite pulp are typically straight, smooth, rounded and largely undamaged. These characteristics make the bonding between the fibers fairly weak.
  • This is achieved by a process known as beating wherein the pulp is subjected to a mechanical rubbing action which flattens the fibers and unravels microfibrils. Thereby the surface area and the hydrogen bonding potential between fibers are greatly increased.
  • Increased beating of pulp therefore generally increases the strength of the pulp (i.e. strength of a hand sheet made from the pulp) as well as the strength of a paper product generated from said pulp.
  • the beating of the pulp is a highly energy demanding step and there is thus a need for improved energy efficient methods for making paper from a chemical pulp.
  • the present inventor has discovered that the energy required for beating a pulp, such that the strength of the pulp reaches a certain value, can be vastly reduced if lignosulfonate is present in the beater during the beating process. Therefore the energy needed for producing a paper product can be vastly reduced if lignosulfonate is added to the process such that the lingosulfonate is present in the beater.
  • a first aspect of the invention relates to a method for production of a paper product comprising the following step:
  • step b) adding lignosulfonate to the chemical pulp such that a chemical pulp comprising lignosulfonate is obtained c) beating the chemical pulp comprising lignosulfonate obtained in step b) such that a beated chemical pulp is obtained, and
  • a second aspect of the invention relates to a method of increasing the efficiency of a beating of a chemical pulp in an industrial process for production of a paper product comprising the following steps:
  • step b) beating the chemical pulp comprising lignosulfonate obtained in step b) such that a beated chemical pulp is obtained
  • step c) optionally producing a paper product from the beated chemical pulp obtained in step c)
  • a third aspect of the invention relates to use of lignosulfonate for increasing the efficiency of a beating of a chemical pulp in an industrial process for production of a paper product.
  • Figure 1 a shows the energy needed for beating of a pulp to a tensile strength of 100 Nm/g in the presence of 1 % lignosulfonate, 0.3 % lignosulfonate or in the absence of lignosulfonate (ref).
  • the y-axis shows the beating energy in kWh/ton.
  • Figure 1 b shows the beating degree of a pulp beated to a tensile strength of 100 Nm/g in the presence of 1 % lignosulfonate, 0.3 % lignosulfonate or in the absence of lignosulfonate (ref).
  • the y-axis shows the beating degree in degree Schopper- Riegler (°SR).
  • Figure 2 a shows the tensile strength of a pulp beated with a beating energy of 100 kWh/t in the presence of 1 % lignosulfonate, 0.3 % lignosulfonate or in the absence of lignosulfonate (ref).
  • the y-axis shows the tensile strength in Nm/s.
  • Figure 2 b shows the compression strength of a pulp beated with a beating energy of 100 kWh/t in the presence of 1 % lignosulfonate, 0.3 % lignosulfonate or in the absence of lignosulfonate (ref).
  • the y-axis shows the compression strength in Nm/s.
  • Figure 3 shows the fiber length of the pulps after beating with different beating energy in the presence of 1 % lignosulfonate, 0.3 % lignosulfonate or in the absence of lignosulfonate (ref).
  • the x-axis shows the beating energy in kWh/ton and the y-axis shows the fiber length in mm.
  • a first aspect of the invention relates to a method for production of a paper product comprising the following step:
  • step b) beating the chemical pulp comprising lignosulfonate obtained in step b) such that a beated chemical pulp is obtained
  • the invention relates to a method of increasing the efficiency of a beating of a chemical pulp in an industrial process for production of a paper product comprising the following steps:
  • step b) beating the chemical pulp comprising lignosulfonate obtained in step b) such that a beated chemical pulp is obtained
  • step c) optionally producing a paper product from the beated chemical pulp obtained in step c)
  • Exemplary embodiments of the first and second aspect are further described below.
  • mechanical pounding and squeezing processes of cellulosic fibers in a pulp can some times be described as beating of a pulp and some times as refining of a pulp.
  • the term beating in the present disclosure covers all these different kinds of mechanical pounding and squeezing processes of pulps.
  • the expression "increasing the efficiency of a beating of a chemical pulp” means that less energy is needed in the beating step to produce a chemical pulp of a certain strength.
  • the strength of the pulp can for example be measured as a tensile strength or a compression strength of a hand sheet produced from the pulp.
  • the expression "industrial process” means that the process in not a laboratory experiment but that a significant and industrially relevant amount of pulp is beated in the beating step, such as for example more than 500 kg/h such as more than 1 ton/h.
  • the addition of lignosulfonate to the beating step can decreases the energy consumed in the beating of a sulfate pulp, to a specific strength, with as much as 50 %. Accordingly, in one embodiment the addition of lignosulfonate added in step b) decreases the energy consumed in step c) with at least 10 % such as at least 20 % such as at least 35 % such as with about 50 %, in the beating of a pulp to a certain strength.
  • CSF Canadian Standard Freeness
  • CSF is not a direct measure concerning the strength properties of pulp but was considered as an adequate estimation by Levon et al.
  • CSF is in fact a measure of the beating degree of the pulp where a low CSF corresponds to a high beating degree. It is also known in the art that a low beating degree (i.e. a high CSF) facilitates the dewatering and drying. Thus a low beating degree is desirable to save energy in the papermaking process. Since Levon et al. approximate strength with beating degree it is not possible to determine from Levon et al.
  • Levon et al. is not at all addressing dewatering aspects or energy saving aspects in the paper making process. Since Levon et al report that unfractionated, lignosulfonate is ineffective, unless it is chemically modified by addition of aminogroups and preferably desulfonation, Levon et al. clearly teaches away from a method according to the present invention where a lignosulfonate obtained from a sulfite pulping process is added to the beating process without any further chemical modification of the lignosulfonate molecules.
  • pulp strength or strength of pulp refers to the strength of a hand sheet (in the art commonly referred to as a paper hand sheet or pulp hand sheet) made from the pulp.
  • the strength of a pulp is an important feature since the strength of the pulp correlates with quality parameters of the final paper products produced from the pulp. For example, increased pulp strength generally leads to increased paper strength.
  • the strength of the pulp is high it is possible to use less fiber (i.e. pulp) and more fillers (e.g. clay and calcium carbonate) to obtain a paper product of a certain quality. Since the cost of the pulp is higher than the cost of the fillers, the total cost of the paper product can be reduced.
  • the present inventor has also demonstrated that the beating degree is lower in a pulp beated in the presence of lignosulfonate compared to a pulp beated to the same strength in the absence of lignosulfonate.
  • a lower beating degree makes it easier to dewater and/or dry the pulp which further saves energy in the process of production of a paper product. Since dewatering of a pulp can be a limiting step of the paper production, the lowered beating degree, mediated by beating in the presence of lignosulfonate, can increase the production capacity of a paper mill. Therefore, in one embodiment the method according to the present invention can be a method for decreasing the energy needed for dewatering and/or drying of a beated chemical pulp.
  • the method according to the present invention can be a method of increasing the production capacity of a paper mill.
  • the method according to the present invention is a method of decreasing the energy consumption in the production of a paper product of certain strength.
  • the method according to the present invention is a method of decreasing the energy consumption in an industrial process for production of a paper product of certain strength.
  • the method according to the present invention is a method of decreasing the energy consumption in a beating step, dewatering step and/or drying step in an industrial process for production of a paper product of certain strength.
  • the method according to the present invention is a method of decreasing the energy consumption in a beating step and in at least a dewatering step and/or a drying step in an industrial process for production of a paper product of certain strength. In one embodiment the method is a method of increasing the strength of a paper product using certain energy consumption in the beating step.
  • the method according to the present invention is suitable both for high concentration (HC) beating and for low concentration beating (LC).
  • HC beating is typically performed at a pulp concentration of about 25-30 % (w/w) and LC beating is typically performed at a pulp concentration of about 2-4% (w/w).
  • LC-beating is very efficient for increasing the strength of the pulp and of the finished paper product and thus in a preferred embodiment the beating in step c) is a LC beating.
  • the concentration of the pulp in step c) is between 1 and 5 % (w/w), such as between 2 and 4 % (w/w).
  • the beating in step c) is a HC beating and in one embodiment the concentration of the pulp in step c) is between 20 and 35 % (w/w), such as between 25 and 30 % (w/w).
  • the present inventor has demonstrated that the addition of lignosulfonate to the beating step can decreases the energy consumed in the beating of a sulfate pulp with as much as 50 % beating the pulp to a certain strength.
  • the method according to the present invention is suitable for any kind of chemical pulp.
  • particularly suitable pulps according to the present invention are sulfate pulps and sulfite pulps. Therefore, in one embodiment the chemical pulp is a sulfate pulp or a sulfite pulp and in a preferred embodiment the chemical pulp is a sulfate pulp.
  • a particularly suitable lignosulfonate according to the present invention is a soft wood lignosulfonate prepared from spent sulfite liquor obtained in a sulfite pulping process.
  • the present inventors have demonstrated that addition of such a lignosulfonate to the beating process can decrease the energy consumed in the beating with as much as 50 %, without any need for a fractionation or chemical modification of the lignosulfonate.
  • the lignosulfonate is a soft wood lignosulfonate and in a preferred embodiment the lignosulfonate added in step b) has been prepared from spent sulfite liquor obtained in a sulfite pulping process.
  • At least part of the lignosulfonate such as at least 50 % (w/w), such as at least 75% (w/w), such as at least 95 % (w/w), is added to step b) without any fractionation of the lignosulfonate and in another embodiment at least part such as at least 50 % (w/w), such as at least 75% (w/w), such as at least 95 % (w/w), of the lignosulfonate is added to step b) without any chemical modification of the
  • lignosulfonate molecules are lignosulfonate molecules.
  • the energy efficiency of the beating process can be even further improved if the lignosulfonate is of a certain molecular weight.
  • a high molecular weight faction in some cases can decrease the energy consumed in the beating more than if for example a non-fractionated lignosulfonate is added.
  • Such high molecular fractions of lignosulfonate can for example be obtained by filtering the lignosulfonate through a 20 kDa membrane cut-off filter or a 30 kDa membrane cut-off filter, or through a 40 kDa membrane cut-off filter, or through a 50 kDa membrane cut-off filter.
  • the average molecular weight of an unfractionated lignosulfonate prepared from spent sulfite liquor is typically in the range 1 -100 kDa.
  • the average molecular weight of the lignosulfonate is 1 -100 kDa, such as 5-75 kDa, such as 10-60 KDa. It is also possible that introduction of chemical modifications in the lignosulfonate can increase the efficiency of the lignosulfonate as a beater additive but this is also less preferred considering the good results of an unmodified
  • the lignosulfonate does not contain amino groups covalently bound the lingosulfonate molecules, In one embodiment at least 75 %, such as at least 90 % of the lignosulfonate molecules does not comprise amino groups.
  • the nitrogen content of the lignosulfonat i.e the content of nitrogen covalently bound to the lignosulfonate molecules, is below 0.5 % (w/w) such as below 0.2 % (w/w).
  • Lignosulfonate molecules obtained in a sulfite pulping process generally only consist of sulfonated lignin and possibly carboxylic acid groups. Therefore, in a preferred embodiment at least 50 %, such as at least 75 %, such at least 90 % of the lignosulfonate molecules only consists of sulfonated lignin and does not comprise any other functional groups except possibly carboxylic acid groups.
  • the lignosulfonate is sulfonated lignin according to the CAS number 8062-15-5.
  • Lignosulfonate is a product which can be recovered from the spent sulfite liquor.
  • isolation of lignosulfonate from spent sulfite liquor involves the step of removing water from the spent sulfite liquor by evaporation. Thereby thick spent liquor having a dry matter content of about 60-70 % can be obtained.
  • this lignosulfonate fraction can be used directly either as fuel in a sulfite pulping process or it can be sold as a valuable product. Alternatively the lignosulfonate can further be spray dried to obtain a dry lignosulfonate product.
  • the present inventors have realized that it is beneficial if the lignosulfonate is added to the beating step in a liquid form since this will facilitate mixing of the lignosulfonate with the pulp. This will in turn further increase the efficiency of the beating. Therefore, in one embodiment the lignosulfonate added in step b) is thick spent liquor which has been obtained by elimination of at least part of the water present in the spent sulfite liquor. In another embodiment the elimination of at least part of the water present in the spent sulfite liquor has been achieved through evaporation. In a preferred embodiment the dry matter content of the lignosulfonate added in step b) is in a range 20-60 %, such as 30-50 %.
  • the present inventor has further realized that in some cases high levels of sugars or sugar acids in the lignosulfonate might have a negative effect on the beating.
  • Sugars can be removed from the lignosulfonate by subjecting the spent sulfite liquor to fermentation. Therefore, in one embodiment the method further comprises a step of fermenting the spent sulfite liquor to decrease the amount of sugars in the
  • the amount of sugars and/or sugar acids in the lignosulfonate added in step b) is below 10 % (w/w) such as below 5 % (w/w). In one embodiment the amounts of sugar acids introduced to the chemical pulp during step a), b) and/or c) is less than 90 g/ ton beaten pulp.
  • lignosulfonates obtainable from a sulfite process is sodium lignosulfonate, magnesium lignosulfonate ammonium lignosulfonate and/or calcium lignosulfonate. For economical reasons it is preferred to use any of these
  • the lignosulfonate is selected from sodium lignosulfonate, magnesium lignosulfonate, ammonium lignosulfonate and/or calcium lignosulfonate.
  • the lignosulfonate is sodium lignosulfonate.
  • lignosulfonate 1 % lignosulfonate to a beating process of a chemical pulp can decrease the energy consumed in the beating step with about 50 %.
  • the effect of addition of lignosulfonate is evident at much lower concentrations.
  • lignosulfonate is a colored polymer, it can some times be preferred to add lower amounts of lignosulfonate to the pulp. For example if a high amount of lignosulfonate is added in a process of producing white paper, more bleach chemicals will be needed. However in most cases it is preferred that the concentration of lignosulfonate is above 0.05% (w/w).
  • the concentration of lignosulfonate in step c) is at least 0.05 % (w/w) such as at least 0.1 % (w/w), such as at least 0.3 % (w/w). In one embodiment the concentration of lignosulfonate is between 0.05 to 5 % (w/w), such as 0.1 to 3 % (w/w), such as 0.3 % to 1 % (w/w).
  • concentration of lignosulfonate mentioned in the present disclosure is in relation to the amount of pulp. For example the expression "addition of 1 % (w/w)
  • lignosulfonate in the present disclosure means that 10 kg lignosulfonate is added to 1 ton of pulp.
  • concentration of pulp is usually about 2 to 4 %. This means that if the concentration of lignosulfonate is 1 % (w/w) in relation to the amount of pulp, and the beating process is performed at a pulp concentration of 4 % (w/w), the actual concentration of lignosulfonate in the beating step is 0.04 % (w/w).
  • the lignosulfonate can be added to the process at any step upstream of the beaters provided that the lignosulfonate will not be removed from the process by for example a washing step prior to the beating. Therefore, in one embodiment, at least part of the lignosulfonate is added to a clean pulp in a step prior to the beating step but after a brown stock washing step. However, it is preferred that the lignosulfonate is added in a step close to the beating, for example directly to the beater. Addition of lignosulfonate directly to the beater facilitates a good mixing of the lignosulfonate with the pulp which further increases the efficiency of the beating.
  • At least part, such as at least 50 %, such as at least 75 %, such as at least 90 % of the lignosulfonate is added directly to the beater in a pulp and/or paper mill.
  • about 10 ton pulp / hour is beated in an industrial beating process in a pulp and/or paper mill.
  • at least 100 kg pulp such as at least 1 ton pulp, such as at least 10 ton pulp is beated in step c).
  • at least 100 kg pulp/hour such as at least 1 ton/ hour such as at least 10 ton/hour is beated in step c).
  • the beating step can be performed in any pulp-beater or pulp-refiner known to the skilled person.
  • beaters and refiners examples include disc refiners and cone refiners.
  • the beating in step c) is performed in a disc refiner and/or cone refiner and in one embodiment the lignosulfonate is added directly to a disc refiner and/or a cone refiner.
  • lignosulfonate can be used in the beating step in the beating of a chemical pulp to reduce the energy consumption in an industrial process for production of a paper product. More specifically the present inventor has shown that use of lignosulfonate in the beating process reduces the energy consumption in the beating process, beating a pulp to a specific strength. This also means that if the same amount of energy is used in the beating process, in the beating of a pulp in the presence of lingosulfonate as in the absence of lignosulfonate, a paper product of higher strength can be produce by addition of lignosulfonate in the beating process.
  • lignosulfonate can be used in the beating process to produce a paper product of increased strength at a certain energy consumption in the beating process. Furthermore lignosulfonate can be used in the beating process for reducing the energy consumption in a drying or dewatering step, subsequent of the beating process in an industrial process for production of a paper product.
  • a third aspect of the invention relates to use of lignosulfonate for increasing the efficiency of a beating of a chemical pulp in an industrial process for production of a paper product.
  • the use of lignosulfonate is for reducing the energy consumption in an industrial process for production of a paper product.
  • the use of lignosulfonate is for reducing energy consumption in the beating step.
  • the use of lignosulfonate is for reducing energy consumption in a drying or dewatering step in an industrial process for production of a paper product.
  • the use of lignosulfonate is for reducing energy consumption in a drying or dewatering step and in a beating step in an industrial process for production of a paper product.
  • a fourth aspect of the invention relates to use of lignosulfonate in a beating step in the beating of a chemical pulp for reducing the energy consumption in an industrial process for production of a paper product.
  • a fifth aspect of the invention relates to use of lignosulfonate in a betating step in the beating of a chemical pulp for reducing energy consumption in a drying or dewatering step in an industrial process for production of a paper product.
  • a sixth aspect of the invention relates to use of lignosulfonate in a betating step in the beating of a chemical pulp for increasing the strength of a paper product produced from the beaten pulp.
  • the lignosulfonate was an unfractionated soft wood lignosulfonate prepared from spent sulfite liquor obtained in a sulfite pulping process (Domsjo fabriker AB, Sweden).
  • the beated pulps were shaped in to sheets having a surface weight of 150g/m 2 .
  • the pulp sheets were analyzed for tensile strength and compression strength.
  • the fiber length and the beating degree were also analyzed.
  • the pulps were beated as described above to a tensile strength of 100 Nm/g.
  • the energy needed for beating a pulp to a tensile strength of 100 Nm/g was reduced with about 50 % by addition of 1 % lignosulfonate (w/w) and with about 20 % by addition of 0.3 % (w/w) lignosulfonate to the pulp.
  • the beating degree was also decrease in the pulps beated in the presence of lignosulfonate, see figure 1 b. A low beating degree is desired since this can save energy in the preceding dewatering and drying steps.
  • the pulps were beated as described above and the fiber lengths of the pulps after beating with different beating energy were analyzed. As can be seen in figure 3, the fiber length is apparently unaffected by addition of lignosulfonate.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
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Abstract

La présente invention concerne un procédé de fabrication d'un produit en papier comprenant les étapes suivantes : a) fournir une pâte chimique, b) ajouter du lignosulfonate à la pâte chimique de manière à obtenir une pâte chimique comprenant du lignosulfonate, c) raffiner en pile la pâte chimique comprenant du lignosulfonate obtenue à l'étape b) de manière à obtenir une pâte chimique raffinée en pile, et d) produire un produit en papier à partir de la pâte chimique raffinée en pile obtenue à l'étape c). Le but de la présente invention est d'augmenter l'efficacité d'un raffinage en pile d'une pâte chimique.
PCT/SE2012/051387 2011-12-20 2012-12-13 Procédé d'augmentation de l'efficacité d'un raffinage en pile d'une pâte chimique Ceased WO2013095266A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE1151226A SE536595C2 (sv) 2011-12-20 2011-12-20 Metod för att öka effektiviteten vid malning av en kemisk massa
SE1151226-6 2011-12-20

Publications (1)

Publication Number Publication Date
WO2013095266A1 true WO2013095266A1 (fr) 2013-06-27

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2849314A (en) * 1953-03-02 1958-08-26 Permanente Cement Company Process of treatment and products from waste sulfite liquors
US3079353A (en) * 1957-03-04 1963-02-26 Gossol Inc Lignosulfonate derivative
CA1176243A (fr) * 1979-08-23 1984-10-16 Carl-Johan Alfthan Materiau a base de lignocellulose a caracteristiques de resistance, d'assechement et de malaxabilite ameliorees, et methode de production connexe
JPH04119187A (ja) * 1990-08-31 1992-04-20 Matsushita Electric Works Ltd パルプの叩解方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2849314A (en) * 1953-03-02 1958-08-26 Permanente Cement Company Process of treatment and products from waste sulfite liquors
US3079353A (en) * 1957-03-04 1963-02-26 Gossol Inc Lignosulfonate derivative
CA1176243A (fr) * 1979-08-23 1984-10-16 Carl-Johan Alfthan Materiau a base de lignocellulose a caracteristiques de resistance, d'assechement et de malaxabilite ameliorees, et methode de production connexe
JPH04119187A (ja) * 1990-08-31 1992-04-20 Matsushita Electric Works Ltd パルプの叩解方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
LEVON K. ET AL.: "Acceleration of the Beating of Pulp by the Use of Pulp by the Use of Modified Lignosulfonate", I: MOKUZAI GAKKAISHI, vol. 32, no. 12, 1986, pages 1011 - 1016 *

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