WO2003025280A1 - Procede pour separer des hemicelluloses d'une biomasse renfermant des hemicelluloses - Google Patents

Procede pour separer des hemicelluloses d'une biomasse renfermant des hemicelluloses Download PDF

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Publication number
WO2003025280A1
WO2003025280A1 PCT/EP2002/010245 EP0210245W WO03025280A1 WO 2003025280 A1 WO2003025280 A1 WO 2003025280A1 EP 0210245 W EP0210245 W EP 0210245W WO 03025280 A1 WO03025280 A1 WO 03025280A1
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Prior art keywords
biomass
hemicelluloses
ammonia
hemicellulose
approximately
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PCT/EP2002/010245
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German (de)
English (en)
Inventor
Ties Karstens
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Rhodia Acetow Gmbh
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Publication of WO2003025280A1 publication Critical patent/WO2003025280A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
    • C08H8/00—Macromolecular compounds derived from lignocellulosic materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
    • C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
    • C08B37/0057—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid beta-D-Xylans, i.e. xylosaccharide, e.g. arabinoxylan, arabinofuronan, pentosans; (beta-1,3)(beta-1,4)-D-Xylans, e.g. rhodymenans; Hemicellulose; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
    • C08B37/006—Heteroglycans, i.e. polysaccharides having more than one sugar residue in the main chain in either alternating or less regular sequence; Gellans; Succinoglycans; Arabinogalactans; Tragacanth or gum tragacanth or traganth from Astragalus; Gum Karaya from Sterculia urens; Gum Ghatti from Anogeissus latifolia; Derivatives thereof
    • 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
    • D21C3/024—Pulping cellulose-containing materials with inorganic bases or alkaline reacting compounds, e.g. sulfate processes with NH3 or H2O
    • 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 invention relates to a method for separating hemicelluloses from hemicellulose-containing biomass.
  • Wood is a natural composite, in which the long and firm cellulose chains, twisted into fibrils, serve as a framework and the hydrophobic lignin acts as a protective covering. Another essential part of the wood are the hemicelluloses (polyoses). For the industrial use of wood, this composite must be destroyed so that the components can be separated (wood digestion). The aim is mostly to obtain more or less pure cellulose, with the other constituents lignin and hemicelluloses, usually in degraded form, being obtained as by-products.
  • paper pulp which, in addition to the main constituent ⁇ -cellulose, contains about 42 to 52%, depending on the type of wood, about 25 to 30% hemelluose, and higher-quality chemical pulp with an ⁇ -cellulose proportion of over 90%, the The proportion of hemicellulose should not exceed a few percent.
  • chemical pulp is one of the most important cost factors in the production of cellulose acetate, filter tow and other high-quality cellulose products.
  • the highest quality standards are placed on the chemical pulp that serves as the starting material for the production of these cellulose products.
  • the cellulose content particularly if subsequent acetylation is intended, should generally be above about 95%.
  • hemicelluloses To produce such chemical pulps from wood or comparable biomass, besides removing the lignin, the hemicelluloses must be separated as far as possible. Numerous processes for the chemical degradation and removal of hemicelluloses from hemicellulose-containing biomass have been developed in the prior art. A classic method of removing hemicelluloses uses a hydrolytic digestion process. The material to be treated can be subjected to hydrolytic digestion, for example by contacting it with superheated steam at elevated pressure. However, the degradation of the hemicelluloses achieved is not selective, and there is also a significant degradation of the cellulose itself.
  • Another possibility is hydrolysis under acidic conditions. Even after this digestion process, the hemicelluloses are not yet selectively broken down. A significant drop in viscosity is observed, which can be attributed to a considerable breakdown of the cellulose, this cellulose breakdown being accompanied by a deterioration in the degree of whiteness.
  • Another known possibility for separating hemicelluloses from hemicellulose-containing biomass consists in selectively degrading the hemicelluloses by means of suitable oxidative or reductive treatment and thus converting them into a soluble and thus extractable form.
  • the chemical reactions taking place are similar to those that are also used in pulp finishing.
  • Oxidative degradation for example with percarbamide, makes it possible in principle to break down hemicelluloses in the paper cell, but high-quality chemical pulps cannot be achieved without a noticeable DP breakdown of the cellulose. Even with these processes, a sufficiently selective degradation of the hemicelluloses cannot be obtained without the associated cellulose degradation.
  • the processes according to the prior art either start from expensive raw materials, in particular cotton linters, or require a complex procedure, which generally leads to more or less severe damage to the pulp, which results in a reduction in the degree of polymerization ( DP value), a loss of reactivity and an undesirable discoloration, for example in a subsequent acetylation.
  • Further disadvantages of classic pulp processes are the high water requirement, the high content of organic substances in the wastewater and the relatively high operating costs.
  • the conventional timber Final processes (sulfate, sulfite) also require sulfur-containing compounds, which also leads to unpleasant odors.
  • Another shed according to DE 101 09 502.3 which has not yet been published, consists in> a process for separating hemicelluloses from hemicellulose-containing biomass by extracting the hemicelluloses from the biomass by means of a complex compound in aqueous solution to form a soluble complex of the hemicelluloses and separating the complexed hemicelluloses from the biomass.
  • the complex compound used here is, for example, [Ni (tris (2-aminoethyl) amine) (OH) 2 ]). This makes it possible to reduce the residual hemicellulose content to below about 2%.
  • the object of the invention was to provide a method for separating hemicelluloses from hemicellulose-containing biomass, which avoids the disadvantages of the methods described above and enables high-quality cellulose to be obtained in a simple and gentle manner.
  • the method is intended to provide a selective separation of the hemicelluloses from hemicellulose-containing biomass without significant cellulose degradation taking place.
  • the process is also intended to be economical, i.e. cost-effective, work and generate as few environmentally harmful emissions as possible.
  • This object is achieved according to the invention by a method for separating hemicelluloses from hemicellulose-containing biomass, in particular wood, and for obtaining pulp with the steps:
  • the process according to the invention accordingly relates to the production of high-quality cellulose with a greatly reduced proportion of hemicelluloses. It enables a highly selective separation of hemicelluloses from hemicellulose-containing biomass under mild conditions, whereby there is no significant degradation of cellulose.
  • the biomass which can be used as starting material in the process according to the invention is not subject to any particular restriction within the scope of the invention.
  • Plant growth materials of various types such as wood, oat husks, maize or grain stalks, bagasse, palm oil fibers, rice straw and straw, such as wheat straw and oat straw, are particularly suitable.
  • wood it is common to use logs or small pieces of wood, preferably in shredded form, e.g. B. in the form of chips.
  • For fibrous raw materials such as annual plants, cut fibers are suitable.
  • Shredded, in particular shredded, wood is preferably used.
  • the use of hardwood or softwood, in particular beech or spruce is particularly preferred.
  • Step (1) of the method according to the invention for separating the hemicelluloses from a biomass is carried out essentially as follows:
  • the hemicellulose-containing biomass is delignified, i.e. freed from lignin.
  • the high molecular weight hemicelluloses should not be broken down into low molecular weight fission products and should remain in the process-modified biomass.
  • a delignification process for lignocellulose-containing biomass according to step (1) of the process according to the invention comprises, for example, the steps: a) dewatering the lignocellulose-containing biomass, b) impregnating the dewatered lignocellulose-containing biomass with an alkanolamm, c) thermally treating the impregnated biomass to decompose the lignin, and d) separating the alkanolamine phase containing the degradation products of the lignin from the delignified biomass.
  • This special delignification procedure will be explained in more detail below:
  • the dehydration of the lignocellulose-containing biomass can be carried out in a press screw after step a) in order to simultaneously achieve a defibrillation of the biomass.
  • Dewatering to a water content of about 20 to 30% is particularly preferred, preferably about 0.25 to 0.45 parts by weight, in particular about 0.35 to 0.45 parts by weight, of water to 1 part by weight.
  • Some lignocellulose-containing biomass (based on dry matter) is not required.
  • step b This is preferably followed by impregnation of the dewatered biomass after step b), the dewatered biomass being able to be treated with an alkanolamm, and about 0.3 to 2.5, in particular about 0.5 to 1.5 parts by weight of alkanolamine per 1 Part by weight of lignocellulose-containing biomass (dry matter) is eliminated.
  • suitable alkanolamines are monoethanolamine, diethanolamine, triethanolamine and / or diglycolamine, preference being given to using monoethanolamine.
  • the thermal treatment which preferably follows the impregnation, for breaking down the lignin according to step c) is expediently carried out under a pressure of about 1 to 10, preferably about 2 to 8, bar.
  • the lignin is preferably broken down to a kappa number of approximately 50 to 5, in particular approximately 40 to 10.
  • the alkanolamine phase which contains the lignin degradation products, is expediently separated from the delignified biomass after the thermal treatment by pressing according to step d).
  • Double screw presses such as those used in the sugar industry and for dewatering paper sludge, have been used are proven to be particularly suitable since investment costs and energy consumption are low.
  • the delignified biomass is very gently dehumidified because the double-screw presses run only slowly and the pressure is exerted over a long period of time.
  • the hemicelluloses are partially broken down into smaller fragments, up to sugars.
  • the acids chemically bound to the hemicelluloses are largely or completely hydrolytically split off during the steam treatment.
  • the fiber material discharged via the cyclone or via the refiner Before delignification by treatment with an alkanolamine, it is therefore preferred to wash the fiber material discharged via the cyclone or via the refiner with a weak alkali solution and to neutralize the acids in the process. It has proven advantageous to use ammonia water for this purpose.
  • the ammonia contained in the ammonia water can not only neutralize the acids, but also acts as a catalyst in the delignification with alkanolamine.
  • its moisture is not higher than 65 to 70%.
  • the pulp should generally be treated with the dilute lye of excess water to be freed. This can be done using equipment commonly used for this purpose, such as press screws, screw presses, centrifuges or twin-wire presses, etc.
  • the displacement and uniform mixing of the fiber material with alkanolamine is preferably carried out in a mixer which, in addition to the mixing tools, also has a knife mechanism for breaking up fiber aggregates or the like. In this way, the fiber material can be mixed homogeneously with the alkanolamine down to mass ratios of 1: 0.5.
  • suitable alkanolamines are:
  • Step (2) The process-modified biomass, which is essentially freed of lignin in this way, can then optionally be subjected to an ammonia treatment. This procedural measure is only optional, since treatment with aqueous
  • Alkali leads to the desired results and sufficient separation of the hemicelluloses.
  • the ammonia can be used as an aqueous solution or as liquefied ammonia.
  • an approximately 5 to 25% aqueous ammonia solution, preferably approximately 2 to 10% aqueous ammonia solution, can be used.
  • the delignified biomass can also advantageously be subjected to a treatment with liquid ammonia with at least partial swelling.
  • a variant according to the invention is, for example, the so-called “ammonia explosion”.
  • the delignified biomass is brought into contact with liquid ammonia at an initial pressure that is higher than atmospheric pressure and at a temperature of at least about 25 ° C., the amount of liquid ammonia being at least for wetting the surface of the biomass is sufficient, and the pressure is then released, the volume available to the biomass / liquid ammonia system being explosively increased by lowering the pressure by at least about 5 bar.
  • This treatment variant in which the amount of liquid ammonia used is suddenly evaporated by increasing the volume / lowering the pressure, differs from the known ammonia evaporation, according to which a pressure drop is brought about by opening a valve on an autoclave and a small amount of the ammonia used is rapidly evaporated. The mass treated with liquid ammonia remains with the remaining ammonia in the autoclave.
  • an explosive increase in volume takes place within a time of less than 1 second, in particular less than 0.5 seconds.
  • the biomass is preferably brought into contact with the liquid ammonia in a pressure device, and the biomass / liquid ammonia system is expanded by transferring it into an explosion space with a larger volume than the pressure device. It has proven to be expedient to set the outlet pressure between approximately 5 and 46 bar, in particular between approximately 25 and 30 bar, the minimum pressure drop of 5 bar being maintained.
  • the temperature correlates with the specified pressure frame from approximately 25 to 85 ° C or approximately 55 to 65 ° C.
  • the outlet pressure in the biomass / liquid ammonia system is preferably explosively at least about 10 bar and in particular which was reduced by about 30 bar. A sufficient amount of ammonia should be injected so that liquid ammonia is present under the pressure and temperature conditions required by the invention and at least the surface of the biomass is wetted.
  • 1 part by weight of delignified biomass preferably accounts for at least about 0.2 to 2 parts by weight, in particular at least about 0.5 to 1 part by weight of ammonia.
  • an extraction of the obtained delignified and hemicellulose-containing biomass is carried out with a dilute, aqueous alkali.
  • aqueous alkali for example, alkali or alkaline earth, in particular sodium hydroxide, are suitable for this.
  • the aqueous alkali is used as an approximately 0.1 to 25% solution, preferably approximately 0.5 to 10% solution, in particular approximately 0.5 to 5% solution.
  • the extraction can be carried out in one or more stages, it being possible to repeatedly extract with the same lye concentration or with a different concentration of the lye solution.
  • a particularly preferred embodiment of the extraction of the delignified and lignin and alkanolamine-free, hemicellulose-containing biomass with a dilute alkali is the countercurrent extraction in an inclined tubular reactor.
  • the material to be extracted is fed in at the lower end, the extractant at the upper end Extraction material in fine distribution, for example by spraying, applied.
  • Both streams, the extraction material and the extraction medium are moved in countercurrent to one another in that the extraction material is conveyed from bottom to top by means of a screw conveyor, and the extraction medium by gravity due to an inclination of the tubular reactor which is to be determined as a function of the hydraulic properties of the extraction material flows from top to bottom through the extraction material.
  • the extractant can a mixture composed of fresh extractant already loaded with extract for the optimum concentration of the extract.
  • solution concentrations of the alkali in the above range show the desired separation of the hemicelluloses.
  • washing steps In order to clean the process-modified biomass obtained in this way from residues of the hemicelluloses which still adhere, it is preferred to subject the biomass to one or more washing steps. Washing with hot water is preferred. It is particularly preferred to carry out the washing steps in a countercurrent process (see above).
  • the method according to the invention can advantageously also be preceded by a so-called pre-hydrolysis.
  • Prehydrolysis is a well-known process step in the pulp industry in which cellulose and lignin are to be attacked as little as possible.
  • the biomass is subjected to a treatment with water or steam (for example the so-called steam explosion or steam refining process).
  • the mass ratio of water or steam to biomass (based on dry substance) is preferably set to about 0.4: 1 to about 3: 1.
  • the pre-hydrolysis of the biomass is expediently carried out under mild conditions, the aim of this process step being to largely break down the hemicelluloses in such a way that their subsequent separation as oligosaccharides is facilitated by extraction with aqueous media.
  • the invention also relates to the biomass obtained by separating the hemicelluloses, which is distinguished by a low residual content of hemicelluloses.
  • the biomass obtained in this way particularly preferably has a residual hemicellulose content of less than about 10, preferably less than about 3% by mass, based on the Carbohydrate content.
  • the biomass obtained in this way can be used directly or further processed in a conventional manner, for example by derivatization.
  • the present invention also relates to the hemicelluloses obtainable by the process according to the invention.
  • Polymeric hemicelluloses have been recognized as valuable biopolymers and can be used as raw materials for industry in a variety of ways.
  • a particularly interesting product, which is present when the hemicelluloses are isolated, is the xylan.
  • Polymeric xylan is particularly in demand in the pharmaceutical sector.
  • Xylan is used as a raw material for the production of xylan polysulfate (pentosan polysulfate), which has a diverse spectrum of activity that is comparable to that of heparin.
  • polymeric hemicelluloses can readily be broken down into the corresponding sugars, so that xylose can be obtained hydrolytically from xylan and then xylitol.
  • the cellulose obtained by the processes according to the invention is a cellulose in which the hemicelluloses are still present in unhydrolyzed form. It is therefore a particular advantage that high-molecular hemicelluloses in particular can also be obtained therefrom. By isolating these valuable products from the holocellulose produced, the economy of the process can be further increased by isolation.
  • Suitable methods for extracting hemicellulose from delignified wood are e.g. See, for example, U.S. Patent No. 3,248, issued April 26, 1966 382 with the title "Method of Isolating Acetylated Polysaccharides" by RH Marchessault and Patricia D. Cafferty.
  • the teaching according to the invention enables swelling to be carried out with considerably less ammonia, based on the biomass, such as wood or pulp. This is particularly the case if, instead of the treatment with liquid ammonia at low temperatures, the biomass to be treated is subjected to the ammonia explosion described above.
  • the advantages associated with the invention are thus multi-layered:
  • the process according to the invention can start from inexpensive raw materials, such as, for example, hemicellulose-rich paper pulps or delignified woods, and leads to high-quality chemical pulp in which the cellulose has not undergone any DP reduction through hydrolytic or oxidative cleavage ,
  • the extraction carried out according to the invention by means of an alkali to remove the remaining hemicelluloses can be easily combined with known delignification methods, such as an alkanolamine extraction from wood.
  • lye such as caustic soda
  • acid stage which precedes the actual bleaching in wood pulping processes.
  • the raw cellulose fibers with a consistency ( solid concentration) of 10 to 30%, a temperature of 90 ° C and a sodium hydroxide solution tration of 1 to 4% by mass exposed to an oxygen pressure of approx. 8 bar.
  • the result of this treatment is that the kappa number of the raw pulp decreases by about 60%.
  • NaOH solution based on fiber, is also used in the peroxide stage in the subsequent bleaching. Since it is possible according to the invention to extract the hemicelluloses with very dilute lye, these amounts of lye make recovery unnecessary.
  • the hemicelluloses separated off are valuable by-products of the process according to the invention and are useful, for example, in the pharmaceutical sector.
  • Comparative Example 2 In order to illustrate the teaching according to US Pat. No. 3,248,382, pulp was subjected to various treatments. As shown in Table 1 below, there was an effect, but ultimately it was not sufficient to achieve a residual hemicellulose content, as is necessary with chemical pulps.
  • VH-MEA or MEA-VH Beech wood was subjected to only weak pre-hydrolysis (VH) and extraction with monoethanolamine (MEA) (VH-MEA or MEA-VH). This also explains the corresponding values for xylose and mannose for the VH-MEA sample. Treatment with 10% or 18% NaOH solution leads to relatively low xylose and especially mannose residues.
  • Beech wood chips were heated with 0.3% sulfuric acid for 15 minutes and hydrolyzed at a temperature of 155 ° C for 60 minutes. After a cooling time of approx. 20 minutes, the following characteristic values were obtained:
  • the wood chips still contained a lot of hemicellulose.
  • Table 4 shows, the hemicelluloses can be removed relatively easily from a beechwood which has been prehydrolyzed in this way by the treatment according to the invention with ammonia and subsequent extraction with sodium hydroxide solution.
  • Residue% dry matter of the pulp after the hemie extraction * 100 dry matter of the pulp before the hemie extraction

Abstract

La présente invention concerne un procédé pour séparer des hémicelluloses d'une biomasse renfermant des hémicelluloses, notamment du bois, et pour récupérer de la pâte. Ce procédé consiste (1) à délignifier la biomasse renfermant des hémicelluloses, à séparer l'extrait, à laver complètement la matière fibreuse,(2) éventuellement à traiter la biomasse délignifiée avec de l'ammoniac, puis (3) à lessiver la biomasse modifiée par le procédé à l'aide de lessive aqueuse diluée, à température ambiante ou à température élevée, afin d'éliminer les hémicelluloses de la pâte résiduelle. Cette invention est notamment caractérisée par son aspect économique. En effet, les matières premières utilisées au départ peuvent être bon marché et on obtient une pâte chimique de haute qualité dans laquelle la cellulose n'a subi aucune diminution du degré de polymérisation par clivage par hydrolyse ou oxydation. On peut encore améliorer l'aspect économique au moyen d'un fonctionnement continu, supprimant ainsi des étapes de procédé supplémentaires pour éliminer l'ammoniac. Les hémicelluloses séparées selon ce procédé constituent des sous-produits de valeur et sont, par exemple, très demandés dans le domaine pharmaceutique.
PCT/EP2002/010245 2001-09-14 2002-09-12 Procede pour separer des hemicelluloses d'une biomasse renfermant des hemicelluloses WO2003025280A1 (fr)

Applications Claiming Priority (2)

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DE10145338.8 2001-09-14
DE2001145338 DE10145338C1 (de) 2001-09-14 2001-09-14 Verfahren zum Abtrennen von Hemicellulosen aus hemicellulosehaltiger Biomasse

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WO2003025280A1 true WO2003025280A1 (fr) 2003-03-27

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Cited By (8)

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WO2007128026A1 (fr) * 2006-05-10 2007-11-15 Lenzing Aktiengesellschaft Procédé de fabrication d'une pâte de cellulose
WO2010043424A1 (fr) * 2008-10-17 2010-04-22 Friedrich Streffer Procédé de digestion d'une biomasse comprenant de la lignine ainsi que de la cellulose et/ou de l'hémicellulose
EP2189488A1 (fr) * 2008-10-17 2010-05-26 Friedrich Dr. Streffer Procédé de digestion de biomasse comportant de la lignine associée à de la cellulose et/ou de l'hémicellulose
EP2446063A1 (fr) * 2009-06-23 2012-05-02 American Process, Inc. Procédé de production d'alcool et d'autres bioproduits à partir de biomasse, utilisé dans la conversion thermique en énergie et procédé d'hydrolyse enzymatique par étapes pour fibre cellulosique
CN104672350A (zh) * 2015-02-16 2015-06-03 广西壮族自治区中国科学院广西植物研究所 一种用于半纤维素生产的秸秆预处理方法
EP2904144A4 (fr) * 2012-10-04 2016-05-25 Api Ip Holdings Llc Procédés permettant de produire de la pâte cellulosique, des sucres et des coproduits à partir d'une biomasse lignocellulosique
WO2023092027A1 (fr) * 2021-11-18 2023-05-25 Kanbol, Inc. Procédé à basse température et basse pression à étapes multiples pour préparation de stock de matière première agricole avec récupération d'hémicellulose et de lignine
EP4117800A4 (fr) * 2020-03-11 2024-04-17 Luonnonvarakeskus Récupération de composants à haute valeur à partir de biomasse

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US3248382A (en) * 1962-09-07 1966-04-26 Fmc Corp Method of isolating acetylated polysaccharides
US4091749A (en) * 1975-01-02 1978-05-30 Macmillan Bloedel Limited Alkaline pulping of lignocellulosic material with amine pretreatment
WO2000061858A1 (fr) * 1999-04-12 2000-10-19 Rhodia Acetow Gmbh Procede pour separer de la biomasse contenant de la lignocellulose
WO2002029155A1 (fr) * 2000-10-05 2002-04-11 Rhodia Acetow Gmbh Procede de production d'holocellulose par delignification de biomasse contenant de la lignocellulose

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US3248382A (en) * 1962-09-07 1966-04-26 Fmc Corp Method of isolating acetylated polysaccharides
US4091749A (en) * 1975-01-02 1978-05-30 Macmillan Bloedel Limited Alkaline pulping of lignocellulosic material with amine pretreatment
WO2000061858A1 (fr) * 1999-04-12 2000-10-19 Rhodia Acetow Gmbh Procede pour separer de la biomasse contenant de la lignocellulose
WO2002029155A1 (fr) * 2000-10-05 2002-04-11 Rhodia Acetow Gmbh Procede de production d'holocellulose par delignification de biomasse contenant de la lignocellulose

Cited By (15)

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Publication number Priority date Publication date Assignee Title
US8500956B2 (en) 2006-05-10 2013-08-06 Lenzing Aktiengesellschaft Process for producing a pulp
WO2007128026A1 (fr) * 2006-05-10 2007-11-15 Lenzing Aktiengesellschaft Procédé de fabrication d'une pâte de cellulose
EP2405056A1 (fr) * 2006-05-10 2012-01-11 Lenzing Aktiengesellschaft Procédé de fabrication d'une matière cellulosique
EP2189488A1 (fr) * 2008-10-17 2010-05-26 Friedrich Dr. Streffer Procédé de digestion de biomasse comportant de la lignine associée à de la cellulose et/ou de l'hémicellulose
US10011851B2 (en) 2008-10-17 2018-07-03 Maxbiogas Gmbh Method for digesting a biomass comprising lignin together with cellulose and/or hemicellulose
US8895290B2 (en) 2008-10-17 2014-11-25 Maxbiogas Gmbh Method for digesting a biomass comprising lignin together with cellulose and/or hemicellulose
WO2010043424A1 (fr) * 2008-10-17 2010-04-22 Friedrich Streffer Procédé de digestion d'une biomasse comprenant de la lignine ainsi que de la cellulose et/ou de l'hémicellulose
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