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Method for extracting hemicellulose from lignocellulosic material

A lignocellulose and hemicellulose technology, applied in water/steam pretreatment, pulp by-product recovery, fermentation, etc., can solve the problems of separating hemicellulose, removing and retaining hemicellulose, etc.

Active Publication Date: 2021-11-12
VALMET OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only a small fraction of available hemicellulose is removed using prior art methods
It is difficult to separate hemicellulose from the alkali added to the hydrolyzate and used for neutralization, and it is also difficult to remove and retain hemicellulose without reducing the efficiency of the pulping process

Method used

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  • Method for extracting hemicellulose from lignocellulosic material
  • Method for extracting hemicellulose from lignocellulosic material
  • Method for extracting hemicellulose from lignocellulosic material

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Embodiment Construction

[0023] The method of the invention is described below, followed by one embodiment of applying the invention to a batch cooking process and one embodiment of applying the invention to a continuous cooking pulp process. The method is applicable to any process in which lignocellulosic material undergoes hydrolysis as part of the pulping process.

[0024] The term lignocellulosic material refers herein to material comprising lignin, cellulose and hemicellulose. One example of such a material is wood, others include other agricultural or forestry waste. Before the pulping process begins, the lignocellulosic material is usually divided into small pieces, chips or shreds.

[0025] When pulping from lignocellulosic materials, the process parameters are chosen so as to obtain a finished pulp of a defined quality in a cost- and time-saving manner as possible. Therefore, the mill has limited possibilities to change any process parameters, and the finished pulp is not allowed to deviate...

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PUM

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Abstract

The present invention relates to a method for extracting hemicellulose from lignocellulosic material. The method comprises providing (11) a quantity of lignocellulosic material comprising a first amount of hemicellulose, determining (12) a desired amount of hemicellulose for extraction, wherein the desired amount of hemicellulose is determined (12) as a portion of the first amount of hemicellulose, supplying (13) the lignocellulosic material to the treatment vessel, performing (14) hydrolysis of the lignocellulosic material for extracting hemicellulose, and supplying (15) a volume of displacement liquor, wherein the volume of displacement liquor is supplied until the desired amount of hemicellulose is displaced from the treatment vessel.

Description

technical field [0001] The present invention relates to a method for extracting hemicellulose from lignocellulosic material, wherein the lignocellulosic material is supplied to a treatment vessel and subjected to acid hydrolysis. Background technique [0002] During the production of dissolving pulp from lignocellulosic material it is often desirable to remove hemicellulose to obtain a pulp with a high content of alpha-cellulose. This also applies to various other kinds of specialty chemical pulps. [0003] Removal is carried out by a prehydrolysis step in which a treatment fluid such as steam or water is introduced and the hemicellulose is hydrolyzed from the chips under acidic conditions. The resulting slurry is then neutralized with an alkaline neutralizing solution to produce a neutralized hydrolyzate. Hemicellulose is broken down into smaller components by contact with alkali and is removed from the pulp during the subsequent washing stages of the pulping process. ...

Claims

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Application Information

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IPC IPC(8): D21C1/02C08B37/14C08H8/00
CPCD21C1/02C08B37/0057C08H8/00D21C11/0007C08B37/14C08B37/0003C08B37/0087C12P2201/00
Inventor L·拉米J·卡冯恩S·米纳H·兰德曼J·沃兹
Owner VALMET OY
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