EP1828254A1 - Procede de production d'hemicelluloses a partir d'un materiau lignocellulosique - Google Patents

Procede de production d'hemicelluloses a partir d'un materiau lignocellulosique

Info

Publication number
EP1828254A1
EP1828254A1 EP05818709A EP05818709A EP1828254A1 EP 1828254 A1 EP1828254 A1 EP 1828254A1 EP 05818709 A EP05818709 A EP 05818709A EP 05818709 A EP05818709 A EP 05818709A EP 1828254 A1 EP1828254 A1 EP 1828254A1
Authority
EP
European Patent Office
Prior art keywords
precipitation
extract
hemicelluloses
organic liquid
water
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Withdrawn
Application number
EP05818709A
Other languages
German (de)
English (en)
Inventor
Nils SCHRÖDER
Jürgen Engelhardt
Nicole Erasmy
Sascha Lebioda
Bode Saake
Jürgen Puls
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.)
PETER KOELLN KGAA KOELLNFLOCKENWERKE
Dow Global Technologies LLC
Original Assignee
Peter Kolln Kgaa Kollnflockenwerke
Wolff Cellulosics GmbH and Co KG
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 Peter Kolln Kgaa Kollnflockenwerke, Wolff Cellulosics GmbH and Co KG filed Critical Peter Kolln Kgaa Kollnflockenwerke
Publication of EP1828254A1 publication Critical patent/EP1828254A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
    • C08H8/00—Macromolecular compounds derived from lignocellulosic materials

Definitions

  • the present invention relates to a process for the recovery of hemicelluloses from lignocellulosic material in high yield and purity.
  • US 2,868,778 and US 2,801,955 disclose the recovery of hemicelluloses by extraction with calcium hydroxide solution or calcium hydroxide-containing solutions.
  • the extract must be acidified before the precipitation in order to obtain low-colored products.
  • US 4,038,481 discloses a process for recovering non-carbohydrate hemicellulose by extraction with alkaline solution and subsequent precipitation of the extract in a water-miscible organic liquid. To increase the yield and improve the product quality, however, the extract is also acidified before the precipitation, which makes it impossible to recover the alkali used.
  • No. 5,112,964 describes a process for obtaining water-soluble hemicellulose from cereal parts.
  • hemicellulose in the form of a gray powder can be obtained in very low yields of not more than 8%, which makes economic use difficult.
  • EP 1 155 104 describes a process for the production of arabinoxylan from maize fibers by alkaline extraction.
  • the hemicelluloses obtained by precipitation with alcohol in good yields are dark in color and have a very broad molar mass distribution which is unfavorable for subsequent reactions.
  • a bleaching system comprising a liquid mixture containing the components water and organic liquid A.
  • the hemicellulose obtained in the precipitation can be bleached. If this bleaching step is carried out in a bleach system whose liquid mixture has a similar or the same composition as the precipitation bath, it can be used immediately after the precipitation without further intermediate steps, e.g. Washes take place. With this simple, economically advantageous procedure can be achieved unexpectedly good bleaching results.
  • the first step a) of the production according to the invention of hemicellulose from lignocellulose is an alkaline extraction known in principle.
  • the lignocellulosic material is extracted with an aqueous alkaline solution.
  • Solution are, for example, alkali metal hydroxides such as sodium hydroxide or potassium hydroxide,
  • Alkaline earth hydroxides such as calcium hydroxide, alkali carbonates such as e.g. Sodium carbonate as well
  • Ammonium Hydroxide ⁇ Preferred are alkali or alkaline earth hydroxides, more preferably sodium hydroxide
  • the extraction process can be carried out at room temperature but also at higher temperatures, under normal pressure up to the boiling point of the extraction solution or in the non-fixed container and beyond the boiling point of the extraction liquid addition, treatment duration and possibly mixing intensity are dependent on the raw material.
  • the alkali concentration to be adjusted is also dependent on the raw material and is preferably between 0.75 and 2.5 eq / l.
  • the extraction can be carried out both in an extraction column with the lignocellulose to be extracted as a stationary phase as well as in the stirred tank.
  • any form of lignocellulose can be used, depending on the desired quality of hemicellulose in upstream process steps cleaned and / or crushed.
  • Lignocelluloses are substances that contain both cellulose fibers and lignin. Examples are virtually all structuring plant parts such as wood, cereal husks, stems of annual one-year plants (i.e., cereal straw) and plant fibers (e.g., jute, flax, cotton). Particularly suitable for the process according to the invention are lignocellulosic substances with only a low content of lignin, e.g. Corn spindles, wheat straw and in particular oat husks.
  • a preferred raw material due to its low lignin content and the associated comparatively easy extractability of the hemicelluloses are oat spelts, more preferably oat hulls, which have been pretreated by roughening their surface by a roller mill.
  • a hemicellulose-containing extract is obtained.
  • the extract yield can be increased if the extraction residue undergoes an additional washing process and the loaded washing medium is then added to the extract.
  • the extract may undergo further intermediate steps before the precipitation begins.
  • the extract undergoes a nanofluidation or electrodialysis stage, whereby alkali is removed from the extract and thus in fact a concentration of the dissolved hemicelluloses occurs.
  • the separation of the hemicelluloses takes place in step b) by introducing the extract into a precipitation medium consisting of water and an organic liquid H which is homogeneously miscible with water, the dissolved hemicelluloses precipitating out of the solution, likewise dissolved undesired, e.g. strongly colored minor components such as e.g. Lignin remain in solution.
  • the composition of the precipitation bath decides to what extent this can be achieved. If the precipitation bath composition is selected accordingly, a large part of the unwanted secondary constituents can be kept in solution with barely reduced hemicellulose yield, as the examples below show.
  • a preferred composition contains the precipitating bath after complete initiation of the extract between 25 and 75% by mass of the organic liquid A, more preferably between 30 and 60% by mass of the organic liquid A.
  • the organic liquid A is preferably selected from the group of Water homogeneously miscible alcohols or ketones selected.
  • suitable alcohols are methanol, ethanol, propanol, isopropanol, butanol and glycol and glycerol.
  • suitable ketones are acetone, methyl ethyl ketone. Very particular preference is given to using methanol, ethanol, isopropanol or acetone.
  • the mechanical separation of the precipitated hemicellulose can be carried out by different methods, for example filtration, centrifugation or filter pressing.
  • the process according to the invention offers the possibility of connecting a bleaching stage in an additional step c) without further intermediate steps.
  • the separated hemicellulose is preferably mixed with a liquid mixture which contains the same components as the precipitation bath, i. Water and organic, water-miscible liquid A contains.
  • Suitable bleaching agents are, for example, chlorine, hypochlorites, chlorine dioxide, oxygen, peroxo compounds, potassium permanganate or ozone, preferably hydrogen peroxide or ozone.
  • Typical concentrations of bleach are, for example, in the case of hydrogen peroxide 1 to 10% based on the solid to be bleached, in the case of ozone 0.01 to 1% based on the solid to be bleached.
  • customary auxiliaries such as, for example, sodium hydroxide, can be used.
  • This procedure offers the advantage that no medium change must be carried out and thus no additional substance components are included.
  • the bleach system is particularly preferably adjusted so that its composition with respect to the components water and organic liquid A corresponds to that of the precipitation bath after completely introduced extract. This procedure offers not only a simplified storage but also the advantage of an additional cleaning effect.
  • Oat husks are extracted with 5% sodium hydroxide solution at a solids content of 10% at 90 0 C for 60 min.
  • the extract obtained by pressing, filtration or centrifugation is then subjected to a precipitation in differently composed methanol-water mixtures. In this case, 200 g of extract are introduced into each 600 g precipitation bath. Yields and kappa numbers of the hemicelluloses obtained by pressing, filtration or centrifugation are given in Table 1.
  • the kappa number indicates the amount of 0.1 n-potassium permanganate solution in ml which is consumed in the treatment of 1 g of dry test substance.
  • the kappa number gives an indication of the degree of pulping of pulps and pulp-like substances (such as hemicelluloses), in particular it gives an indication of the residual lignin content.
  • Kappa number is a pulping method known to those skilled in the art and used internationally for pulps and is described e.g. according to Zellcheming leaflet FV / 37/80.
  • Table 1 Yields and kappa numbers of hemicelluloses obtained by precipitation of an alkaline oat spelled extract in methanol-water mixtures
  • Oat husks are extracted with 5% sodium hydroxide in a consistency of 10% at 90 0 C for 60 min.
  • the extract obtained by pressing, filtration or centrifugation is then treated with conc. Neutralized sulfuric acid and then subjected to precipitation in differently composed methanol-water mixtures. In this case, 200 g of extract are introduced into each 600 g precipitation bath. Yields and kappa numbers of the hemicelluloses obtained by pressing, filtration or centrifugation are given in Table 2.
  • Table 2 Yields and kappa numbers of hemicelluloses obtained by precipitation of a neutralized oat spelled extract in methanol-water mixtures
  • Oat husks are extracted with 5% sodium hydroxide in a consistency of 10% at 9O 0 C for 60 min.
  • the extract obtained by pressing, filtration or centrifugation is then subjected to a precipitation in differently composed isopropanol-water mixtures. In this case, 200 g of extract are introduced into each 600 g precipitation bath. Yields and Kappa numbers of the hemicelluloses obtained by pressing, filtration or centrifugation are given in Table 3.
  • Table 3 Yields and kappa numbers of hemicelluloses obtained by precipitation of an alkaline oat spelled extract in isopropanol-water mixtures
  • Precipitated hemicellulose from Example 2 (60% w / w MeOH content in the precipitation) is in methanol-water mixtures of different compositions with the addition of 4% sodium hydroxide solution and 6% hydrogen peroxide (each based on Rohxylan atro) in a consistency of 10% 90 0 C treated for 120 minutes.
  • Kappa numbers and whiteness of the bleached hemicelluloses obtained by pressing, filtration or centrifugation are given in Table 4.
  • Table 4 Whiteness and kappa numbers of hemicelluloses obtained after peroxide bleaching in methanol-water mixtures
  • the best bleaching result is achieved with a methanol content in the bleaching slurry of 50 to 60% and is thus also in the range of the optimal composition for the precipitation.
  • Precipitated hemicellulose from Example 3 (40% w / w IPA content in the precipitation) is in isopropanol-water mixtures of different compositions with the addition of 0.9% sodium hydroxide solution and 4% hydrogen peroxide (each based on Rohxylan atro) in a fabric density of 10% treated at 90 0 C for 120 min.
  • Kappa numbers and degrees of whiteness of the bleached hemicelluloses obtained by pressing, filtration or centrifugation are given in Table 5.
  • the best bleaching result is achieved with an isopropanol content in the bleach slurry of 40% and is therefore also in the range of optimum composition for the precipitation.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Biochemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Molecular Biology (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Compounds Of Unknown Constitution (AREA)

Abstract

La présente invention concerne un procédé de production à haut rendement d'hémicelluloses d'une grande pureté à partir d'un matériau lignocellulosique.
EP05818709A 2004-12-15 2005-12-03 Procede de production d'hemicelluloses a partir d'un materiau lignocellulosique Withdrawn EP1828254A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004060283A DE102004060283A1 (de) 2004-12-15 2004-12-15 Verfahren zur Gewinnung von Hemicellulosen aus lignocellulosischem Material
PCT/EP2005/012974 WO2006066724A1 (fr) 2004-12-15 2005-12-03 Procede de production d'hemicelluloses a partir d'un materiau lignocellulosique

Publications (1)

Publication Number Publication Date
EP1828254A1 true EP1828254A1 (fr) 2007-09-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP05818709A Withdrawn EP1828254A1 (fr) 2004-12-15 2005-12-03 Procede de production d'hemicelluloses a partir d'un materiau lignocellulosique

Country Status (7)

Country Link
US (1) US20060128952A1 (fr)
EP (1) EP1828254A1 (fr)
AU (1) AU2005318574A1 (fr)
CA (1) CA2580414A1 (fr)
DE (1) DE102004060283A1 (fr)
NO (1) NO20071325L (fr)
WO (1) WO2006066724A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102388177A (zh) * 2009-04-02 2012-03-21 奥本大学 包括半纤维素的提取方法和提取半纤维素的木质纤维素材料的处理方法的用于品质保护的制浆工艺
EP2643357B1 (fr) * 2010-11-23 2017-02-22 Ecohelix AB Procédé pour augmenter le poids moléculaire de mannanes et de xylanes du bois comprenant des parties aromatiques
JP2015086349A (ja) * 2013-11-01 2015-05-07 株式会社ダイセル 増粘剤
CA2933824C (fr) 2014-03-19 2020-03-10 Cnh Industrial Canada, Ltd. Appareil et procede de lavage pour la preparation de fibres de cellulose destinees a etre utilisees pour la fabrication de materiaux biocomposites
WO2016199042A1 (fr) * 2015-06-10 2016-12-15 Stora Enso Oyj Procédés de traitement de matières lignocellulosiques
EP3222779A1 (fr) 2016-03-22 2017-09-27 Jäckering Mühlen- und Nährmittelwerke GmbH Masse de revetement amylacee
CN110981993A (zh) * 2019-11-21 2020-04-10 昆明理工大学 一种禾草类原料中提取分离半纤维素的集成处理设备及方法

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1819233A (en) * 1930-04-10 1931-08-18 Cornstalk Products Company Inc Preparation of pentosans
US2709699A (en) * 1952-07-18 1955-05-31 Michael J Wolf Extracting hemicelluloses
US2868778A (en) * 1954-04-21 1959-01-13 Corn Prod Refining Co Process for extracting hemicellulose from corn coarse fiber
US2801955A (en) * 1955-11-17 1957-08-06 Nat Starch Products Inc Process for extraction of hemicellulose
US3854995A (en) * 1973-03-19 1974-12-17 Sanyo Kokusaku Pulp Co Process for the recovery of sugars from spent sulfite liquor
FI49438C (fi) * 1973-07-23 1980-12-23 Keskuslaboratorio Foerfarande foer avlaegsnande av hemicellulosa ur hemicellulosahaltiga alkaliloesningar i processcirkulation
US4038481A (en) * 1976-05-24 1977-07-26 Standard Brands Incorporated Method for treatment of corn hulls
AT377679B (de) * 1983-02-24 1985-04-25 Chemiefaser Lenzing Ag Verfahren zur herstellung von ballaststoff -angereicherten, joule-reduzierten backwaren
JPH0611764B2 (ja) * 1988-12-07 1994-02-16 雪印乳業株式会社 水溶性ヘミセルロースの製造方法
US5352264A (en) * 1991-10-15 1994-10-04 Medina Vega Luis R Seed hull extracts
US6589760B1 (en) * 1999-02-10 2003-07-08 Eastman Chemical Company Methods of separating a corn fiber lipid fraction from corn fiber

Non-Patent Citations (1)

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Title
See references of WO2006066724A1 *

Also Published As

Publication number Publication date
WO2006066724A1 (fr) 2006-06-29
CA2580414A1 (fr) 2006-06-29
NO20071325L (no) 2007-04-03
DE102004060283A1 (de) 2006-06-29
AU2005318574A1 (en) 2006-06-29
US20060128952A1 (en) 2006-06-15

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