Process for isolation of hemicelluloses from biomass pulping process waters or spent liquors

A technology of hemicellulose and process water, which is applied in the field of separating hemicellulose, can solve the problems of inability to transform into industrial applications and low product concentration, and achieve the effects of low processing cost, good separation, and easy reuse

Active Publication Date: 2019-04-16
ANDRITZ AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the need for large ultrafiltration equipment and the still relatively low concentration of the product, especially with further thermal concentration and / or treatment, this process cannot be translated into industrial applications

Method used

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  • Process for isolation of hemicelluloses from biomass pulping process waters or spent liquors

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Embodiment Construction

[0014] This process of separating hemicellulose can be used in mechanical pulping lines, semichemical and chemical pulping equipment. It can be implemented in existing equipment or in rebuilding projects. The process is suitable for biomass, hardwood (xylan) and softwood (polygalactose glucomannose (GGM)) pulping line process water and waste liquor treatment using high temperature water extraction or alkaline treatment of biomass.

[0015] Typical pulping lines for the separation of hemicellulose from process water, bleaching plants and waste liquors are:

[0016] - Hardwood kraft pulping plant with alkaline prehydrolysis

[0017] - Hardwood kraft pulping plants with an alkaline extraction stage before or after bleaching

[0018] -Hardwood NSSC semi-chemical pulping line

[0019] -Hardwood green liquor semi-chemical pulping production line

[0020] - Mechanical and semi-chemical pulping lines for annual plants (bagasse, kenaf, etc.)

[0021] -TMP process white water

[0...

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Abstract

The invention relates to a process for isolation of hemicelluloses from biomass pulping process waters or spent liquors with removal of suspended solids, concentration of the product and purificationof the product by removal of inorganic salts and low molecular weight substances. It is characterized in that the hemicellulose isolation process conditions at several separation/purification stages are adjusted separately by e.g. pH adjustment. The invention further relates to a plant for carrying out the process. With such process and plant it is possible to recover most of the suspended solids,especially xylan and other hemicelluloses.

Description

technical field [0001] The present invention relates to a method for separating hemicellulose from biomass pulping process water and waste liquor, the method comprising removing suspended solids, concentrating the product and purifying the product by removing inorganic salts and small molecular substances. Background technique [0002] Separation of valuable biological products from biomass pulping process water (TMP white water, bleaching press liquor) and spent liquors (alkaline prehydrolysis, alkaline extraction of kraft pulp for dissolving pulp grades) has been used for the past decades Significant efforts have been made in the development of processes, especially for the separation of lignin and hemicellulose. Typically, however, the extracted polymeric hemicellulose (e.g., xylo-oligosaccharides (XOS)) is further converted into sugars, which are converted into biofuels (e.g., ethanol) or other alkaline chemicals, such as succinic and lactic acids, which are further used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/00D21C11/04D21C11/10
CPCC08B37/0003D21C11/0007D21C11/0085D21C11/0042D21C11/04D21C11/10Y02E50/10D21C11/00
Inventor 奥列格·沙盖夫卢卡斯·维塞格
Owner ANDRITZ AG
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