EP0008783A1 - Procédé et moyen pour la décomposition de matières végétales - Google Patents
Procédé et moyen pour la décomposition de matières végétales Download PDFInfo
- Publication number
- EP0008783A1 EP0008783A1 EP79103230A EP79103230A EP0008783A1 EP 0008783 A1 EP0008783 A1 EP 0008783A1 EP 79103230 A EP79103230 A EP 79103230A EP 79103230 A EP79103230 A EP 79103230A EP 0008783 A1 EP0008783 A1 EP 0008783A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- acid
- weight
- lignin
- water
- acids
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000463 material Substances 0.000 title claims description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229920005610 lignin Polymers 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000002253 acid Substances 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 21
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229920002678 cellulose Polymers 0.000 claims abstract description 17
- 239000001913 cellulose Substances 0.000 claims abstract description 16
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 claims abstract description 13
- 150000007513 acids Chemical class 0.000 claims abstract description 13
- 230000007062 hydrolysis Effects 0.000 claims abstract description 11
- 238000006460 hydrolysis reaction Methods 0.000 claims abstract description 11
- 150000002972 pentoses Chemical class 0.000 claims abstract description 11
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 150000008064 anhydrides Chemical class 0.000 claims abstract description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 4
- 239000011707 mineral Substances 0.000 claims abstract description 4
- 150000007524 organic acids Chemical class 0.000 claims abstract description 4
- 235000005985 organic acids Nutrition 0.000 claims abstract description 4
- 238000010494 dissociation reaction Methods 0.000 claims abstract description 3
- 230000005593 dissociations Effects 0.000 claims abstract description 3
- 230000029087 digestion Effects 0.000 claims description 14
- 229920001864 tannin Polymers 0.000 claims description 8
- 239000001648 tannin Substances 0.000 claims description 8
- 235000018553 tannin Nutrition 0.000 claims description 7
- 235000013311 vegetables Nutrition 0.000 claims description 7
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 235000010980 cellulose Nutrition 0.000 claims 2
- 238000004821 distillation Methods 0.000 abstract description 2
- 238000000354 decomposition reaction Methods 0.000 abstract 1
- 239000001117 sulphuric acid Substances 0.000 abstract 1
- 235000011149 sulphuric acid Nutrition 0.000 abstract 1
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 12
- 235000000346 sugar Nutrition 0.000 description 11
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 9
- 239000002023 wood Substances 0.000 description 9
- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 description 8
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 5
- 229920002488 Hemicellulose Polymers 0.000 description 5
- 240000000731 Fagus sylvatica Species 0.000 description 4
- 235000010099 Fagus sylvatica Nutrition 0.000 description 4
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 description 4
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 239000010902 straw Substances 0.000 description 4
- 238000005406 washing Methods 0.000 description 4
- 208000023514 Barrett esophagus Diseases 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000001704 evaporation Methods 0.000 description 3
- 235000006408 oxalic acid Nutrition 0.000 description 3
- 230000001376 precipitating effect Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 235000018185 Betula X alpestris Nutrition 0.000 description 2
- 235000018212 Betula X uliginosa Nutrition 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- AFVFQIVMOAPDHO-UHFFFAOYSA-N Methanesulfonic acid Chemical compound CS(O)(=O)=O AFVFQIVMOAPDHO-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 241000219000 Populus Species 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 240000008042 Zea mays Species 0.000 description 2
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 2
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 2
- 229960000583 acetic acid Drugs 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 235000005822 corn Nutrition 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000002242 deionisation method Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000000706 filtrate Substances 0.000 description 2
- 229940093915 gynecological organic acid Drugs 0.000 description 2
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 2
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229910052573 porcelain Inorganic materials 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 150000008163 sugars Chemical class 0.000 description 2
- 239000005418 vegetable material Substances 0.000 description 2
- 125000000969 xylosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)CO1)* 0.000 description 2
- LBLYYCQCTBFVLH-UHFFFAOYSA-N 2-Methylbenzenesulfonic acid Chemical compound CC1=CC=CC=C1S(O)(=O)=O LBLYYCQCTBFVLH-UHFFFAOYSA-N 0.000 description 1
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 241000609240 Ambelania acida Species 0.000 description 1
- 241001070941 Castanea Species 0.000 description 1
- 235000014036 Castanea Nutrition 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical class CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 241000183024 Populus tremula Species 0.000 description 1
- 244000040384 Quercus garryana Species 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 235000009754 Vitis X bourquina Nutrition 0.000 description 1
- 235000012333 Vitis X labruscana Nutrition 0.000 description 1
- 240000006365 Vitis vinifera Species 0.000 description 1
- 235000014787 Vitis vinifera Nutrition 0.000 description 1
- 238000005903 acid hydrolysis reaction Methods 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 229940045348 brown mixture Drugs 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 210000001520 comb Anatomy 0.000 description 1
- 238000004042 decolorization Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 239000012362 glacial acetic acid Substances 0.000 description 1
- 239000010903 husk Substances 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229940098779 methanesulfonic acid Drugs 0.000 description 1
- GRVDJDISBSALJP-UHFFFAOYSA-N methyloxidanyl Chemical group [O]C GRVDJDISBSALJP-UHFFFAOYSA-N 0.000 description 1
- 150000007522 mineralic acids Chemical class 0.000 description 1
- 150000003009 phosphonic acids Chemical class 0.000 description 1
- 235000011007 phosphoric acid Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical class CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-L sulfite Chemical class [O-]S([O-])=O LSNNMFCWUKXFEE-UHFFFAOYSA-L 0.000 description 1
- -1 sulfo compound Chemical class 0.000 description 1
- 125000000020 sulfo group Chemical group O=S(=O)([*])O[H] 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13K—SACCHARIDES OBTAINED FROM NATURAL SOURCES OR BY HYDROLYSIS OF NATURALLY OCCURRING DISACCHARIDES, OLIGOSACCHARIDES OR POLYSACCHARIDES
- C13K13/00—Sugars not otherwise provided for in this class
- C13K13/002—Xylose
-
- 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
- D21C3/20—Pulping cellulose-containing materials with organic solvents or in solvent environment
Definitions
- the present invention relates to a method and a means for digesting vegetable raw materials at higher temperatures and elevated pressure for the simultaneous production of pentoses, lignin and cellulose.
- the method by which vegetable raw materials are broken down depends on whether one prefers to obtain cellulose or pentoses from the raw material. To Ge When cellulose is obtained, the materials are broken down using alkali and alkaline earth sulfites or the sulfate process. The lignin is obtained in the form of sulfo compounds as an annoying by-product.
- the vegetable raw materials are preferably subjected to acidic hydrolysis, as can be seen, for example, from German patent 12 04 149.
- Cello lignin is obtained as a solid residue.
- German patent specification 19 29 268 describes the processing of sulfite lye to obtain pentoses by extraction with organic solvents.
- a method for the production of xylose and cellulose is described in French patent specification 1 477 305; treating plant material with dilute acids and hydrolyzing and dissolving the hemicelluloses contained therein.
- the residue, which contains lignin and cellulose is freed of lignin by sulfite or sulfate digestion.
- the cellulose obtained can be processed into spinnable viscose. With this digestion, large amounts of wastewater are naturally produced, which are associated with the degradation pro products of the lignin are heavily contaminated.
- the aim of the present invention is a method and an agent with which both cellulose, pentoses and lignin are obtained in a directly usable form during digestion. Contrary to the finding in Ullmann's Encyclopedia, Volume 11, page 780, that acid lignin, ie lignin from vegetable material treated with strong acids, is insoluble in acids and organic solvents, it was surprisingly found that extraction of Lig nin together with a high proportion of hemicellulose hydrolyzates is readily possible if the hydrolysis of the vegetable raw material is carried out with the addition of strong acids, water and alcohol. A cellulose containing only a little lignin and hemicelluloses is thus obtained.
- Mineral or organic acids which have a dissociation constant of at least 1.76 are advantageously used for the digestion process. 10 -4 have, or mixtures thereof.
- Preferred acids are sulfuric acid, sulfurous acid, hydrochloric acid, methane and toluenesulfonic acid.
- Oxalic acid, tartaric acid and citric acid as well as phosphoric acid and phosphonic acids are also suitable for the digestion process.
- anhydrides can also be used.
- the sulfurous acid is particularly suitable, as it is very easy to remove after the digestion has ended, since it is volatile and can be distilled off with the alcohol and part of the water, with the lignin precipitating. The extensive treatment with anion exchangers can thus largely be avoided.
- sulphurous acid used in similar concentrations to sulfuric acid, leads to equally good results with short digestion times.
- sulphurous acid can be added to the digestion mixture as a solution or can be introduced into the hydrolysis mixture in gaseous form as an anhydride.
- the lignin is precipitated in a known manner by evaporating the added alcohol, although separation problems can occur due to the resinous separation of the lignin.
- This disadvantage can be overcome when using plant material containing tannins, e.g. Oak wood, chestnut wood, sawn timber or grape combs as such or in a mixture with other types of wood, e.g. Avoid beech and birch, or straw as much as possible.
- the mixture used for the digestion should contain 10 to 40% by weight of alcohol, 0.2 to 2% by weight of the acids mentioned and the remainder water. Preference is given to a digestion mixture containing 0.4 to 1.5, in particular 0.8 to 1.2,% by weight of sulfurous acid, 0.4 to 0.6% by weight, hydrochloric acid or 0.5 to 0.8% by weight. % Sulfuric acid, 20 to 40 wt.% Alkanol and water contains.
- Lower alcohols are suitable as alkanols; methanol, ethanol, propanols and butanols are preferably used.
- the process is carried out in such a way that the material to be digested is heated in a pressure vessel to temperatures of 140 to 190.degree. C., in particular 160 to 180.degree. C. after the alcohol-acid / water mixture has been added for 1 to 5 hours.
- a liquor ratio of solid: hydrolysis liquid of 1: 3 to 1:10, preferably 1: 4 to 1: 6, is set.
- the hydrolysis solution is decanted off and the residue, which mainly consists of cellulose, is washed several times with 50% alcohol and then dried.
- the hydrolysis and washing solution are concentrated to 1/5 to 1/6 of their volume, the lignin precipitating.
- the P are entosen contained in the remaining solution, is carried out its work-up for the recovery of the pentoses, particularly xylose in a conventional manner, namely, treatment with Entfärberharz, deionization and evaporation to crystallization.
- 200g beech chips (calculated as dry matter) are mixed in a stainless steel autoclave with 180g ethanol and 220g dilute sulfuric acid, which contains 1.8g H 2 S0 4 .
- the pressure vessel is then heated to 175 to 180 ° C and left in this temperature range for 1 hour. After cooling, the dark brown solution is decanted off and the residue is washed twice with 200 ml of warm 50% ethanol. After drying, 77.9 g of residue with a methoxyl content of less than 2% are obtained.
- the combined solutions are concentrated in a water jet vacuum to 1/5 to 1/6 of their original volume, a resinous mass separating out, which mainly consists of lignin.
- the brownish-colored solution decanted from this contains 39.2 g of reducing sugar.
- the pentose content is 34.6 g.
- 21 g of xylose could be crystallized by adding methanol.
- the solution contains 47.2 g of reducing sugar, the dry cellulose residue is 65.3 g and 50.2 g are separated off as the lignin tanning powder. After decolorization and deionization of the sugar solution, 26.4 g of xylose could be obtained after repeated crystallization.
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Organic Chemistry (AREA)
- Paper (AREA)
- Compounds Of Unknown Constitution (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Medicines Containing Plant Substances (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2838380 | 1978-09-02 | ||
| DE19782838380 DE2838380A1 (de) | 1978-09-02 | 1978-09-02 | Verfahren und mittel zum aufschliessen pflanzlicher rohstoffe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0008783A1 true EP0008783A1 (fr) | 1980-03-19 |
Family
ID=6048563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP79103230A Withdrawn EP0008783A1 (fr) | 1978-09-02 | 1979-08-31 | Procédé et moyen pour la décomposition de matières végétales |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0008783A1 (fr) |
| DE (1) | DE2838380A1 (fr) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0224470A1 (fr) * | 1985-11-29 | 1987-06-03 | Neusiedler Aktiengesellschaft für Papierfabrikation | Procédé de production de pâte cellulosique à partir de matière fibreuse végétale |
| WO1991005102A1 (fr) * | 1989-09-28 | 1991-04-18 | Feldmühle Aktiengesellschaft | Procede pour fabriquer des pates chimio-mecaniques et/ou chimio-thermo-mecaniques |
| EP2027159A4 (fr) * | 2006-06-12 | 2012-02-01 | American Process Inc | Procédé de traitement étape par étape d'un matériau lignocellulosique pour produire des composés chimiques de base réactifs |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4965825A (en) | 1981-11-03 | 1990-10-23 | The Personalized Mass Media Corporation | Signal processing apparatus and methods |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1856567A (en) * | 1929-11-02 | 1932-05-03 | Kleinert Theodor | Process of decomposing vegetable fibrous matter for the purpose of the simultaneous recovery both of the cellulose and of the incrusting ingredients |
| US2380448A (en) * | 1941-01-25 | 1945-07-31 | Northwood Chemical Company | Lignin and method of production |
| US2959500A (en) * | 1956-02-14 | 1960-11-08 | Schweizerische Eidgenossenschaft | Process for the saccharification of cellulose and cellulosic materials |
| CH358391A (de) * | 1956-12-12 | 1961-11-15 | Udic Societe Anonyme | Verfahren zur Herstellung von Zuckerlösungen aus Pflanzenmaterialien |
| WO1979000119A1 (fr) * | 1977-08-31 | 1979-03-22 | Thermoform Ag | Procede permettant la delignification et la transformation en sucre de materiaux vegetaux lignocellulosiques par utilisation de solvants organiques |
-
1978
- 1978-09-02 DE DE19782838380 patent/DE2838380A1/de not_active Withdrawn
-
1979
- 1979-08-31 EP EP79103230A patent/EP0008783A1/fr not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1856567A (en) * | 1929-11-02 | 1932-05-03 | Kleinert Theodor | Process of decomposing vegetable fibrous matter for the purpose of the simultaneous recovery both of the cellulose and of the incrusting ingredients |
| US2380448A (en) * | 1941-01-25 | 1945-07-31 | Northwood Chemical Company | Lignin and method of production |
| US2959500A (en) * | 1956-02-14 | 1960-11-08 | Schweizerische Eidgenossenschaft | Process for the saccharification of cellulose and cellulosic materials |
| CH358391A (de) * | 1956-12-12 | 1961-11-15 | Udic Societe Anonyme | Verfahren zur Herstellung von Zuckerlösungen aus Pflanzenmaterialien |
| WO1979000119A1 (fr) * | 1977-08-31 | 1979-03-22 | Thermoform Ag | Procede permettant la delignification et la transformation en sucre de materiaux vegetaux lignocellulosiques par utilisation de solvants organiques |
Non-Patent Citations (1)
| Title |
|---|
| THE JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol. LXIII, Juli-Dezember 1941, Seiten 3041-3048 W.B. HEWSON et al.: "Studies on Lignin and Related Compounds. LVII. Mechanism of the Ethanolysis Reaction" * Seite 3046; Tabel I * * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0224470A1 (fr) * | 1985-11-29 | 1987-06-03 | Neusiedler Aktiengesellschaft für Papierfabrikation | Procédé de production de pâte cellulosique à partir de matière fibreuse végétale |
| WO1991005102A1 (fr) * | 1989-09-28 | 1991-04-18 | Feldmühle Aktiengesellschaft | Procede pour fabriquer des pates chimio-mecaniques et/ou chimio-thermo-mecaniques |
| EP2027159A4 (fr) * | 2006-06-12 | 2012-02-01 | American Process Inc | Procédé de traitement étape par étape d'un matériau lignocellulosique pour produire des composés chimiques de base réactifs |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2838380A1 (de) | 1980-03-20 |
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