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Method for producing xylitol with hemicellulose extracted from liquid waste of regenerated cellulose fiber production or papermaking

A technology for regenerating cellulose and hemicellulose, which is applied in the production of xylose, the reduction and preparation of oxygen-containing functional groups, organic chemistry, etc. The effect of reducing pollution

Active Publication Date: 2017-01-25
唐山三友集团兴达化纤有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of regenerated cellulose fiber production and paper pulping production, due to the action of alkali on the raw material pulp, a large amount of hemicellulose is produced. When these excess hemicellulose reaches a certain concentration, it will affect the normal operation of the main process. Conventional treatment methods include enriched combustion and low-concentration discharge after dilution, but no matter which treatment method, it will pollute the environment and increase the cost, which is a waste of resources

Method used

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  • Method for producing xylitol with hemicellulose extracted from liquid waste of regenerated cellulose fiber production or papermaking
  • Method for producing xylitol with hemicellulose extracted from liquid waste of regenerated cellulose fiber production or papermaking

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Embodiment 1

[0042] A method for producing xylitol as a raw material from hemicellulose extracted from regenerated cellulose fiber production or papermaking waste liquid, comprising the following steps:

[0043] (1) collect the waste liquid that regenerated cellulose fiber produces, as hemicellulose stoste, in described hemicellulose stoste after testing, sodium hydroxide content is 0.5%, and hemicellulose content is 60g / L, also has soft water and A small amount of impurities;

[0044] (2) The hemicellulose stock solution is added in the hydrolysis tank, and sulfuric acid and an appropriate amount of water are added thereto, so that the massfraction of sulfuric acid in the hydrolyzate in the hydrolysis tank is 1.0%, and the solid content of hemicellulose and the bath ratio of the hydrolyzate are 1:10, the hemicellulose stock solution is cracked under the catalysis of sulfuric acid, the cracking temperature is 110°C, and the time is 2.5 hours, the hemicellulose in the hemicellulose stock so...

Embodiment 2

[0049] A method for producing xylitol as a raw material from hemicellulose extracted from regenerated cellulose fiber production or papermaking waste liquid, comprising the following steps:

[0050] (1) collect the waste liquid that regenerated cellulose fiber produces, as hemicellulose stoste, in described hemicellulose stoste after testing, sodium hydroxide content is 3%, and hemicellulose content is 55g / L, also has soft water and A small amount of impurities;

[0051] (2) The hemicellulose stock solution is added in the hydrolysis tank, and sulfuric acid and an appropriate amount of water are added thereto, so that the massfraction of sulfuric acid in the hydrolyzate in the hydrolysis tank is 2.0%, and the hemicellulose solid content and the bath ratio of the hydrolyzate are 1:8, the hemicellulose stock solution is cracked under the catalysis of sulfuric acid, the cracking temperature is 120°C, and the time is 1 hour, the hemicellulose in the hemicellulose stock solution co...

Embodiment 3

[0056] A method for producing xylitol as a raw material from hemicellulose extracted from regenerated cellulose fiber production or papermaking waste liquid, comprising the following steps:

[0057] (1) collect the waste liquid that regenerated cellulose fiber produces, as hemicellulose stock solution, in described hemicellulose stock solution after testing, sodium hydroxide content is 1.2%, and hemicellulose content is 57g / L, also has soft water and A small amount of impurities;

[0058] (2) The hemicellulose stock solution is added in the hydrolysis tank, and sulfuric acid and an appropriate amount of water are added thereto, so that the massfraction of sulfuric acid in the hydrolyzate in the hydrolysis tank is 1.3%, and the hemicellulose solid content and the bath ratio of the hydrolyzate are 1:9, the hemicellulose stock solution is cracked under the catalysis of sulfuric acid, the cracking temperature is 115°C, and the time is 2 hours, the hemicellulose in the hemicellulos...

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Abstract

The invention relates to a method for producing xylitol with hemicellulose extracted from liquid waste of regenerated cellulose fiber production or papermaking. The method includes: collecting the liquid waste of regenerated cellulose fiber production or papermaking as an original hemicellulose solution; splitting the original hemicellulose solution under the sulphuric acid catalyst action and allowing the hemicellulose in the original hemicellulose solution and water to combine to form pentose to obtain hydrolysate; subjecting the hydrolysate to decoloration by the aid of a decolorizing agent; after decoloration, subjecting the hydrolysate to primary ion exchange with anion exchange resin to remove sulfate ions from the hydrolysate; subjecting the hydrolysate to primary concentration, secondary ion exchange, hydrotreating, tertiary ion exchange and secondary concentration to finally obtain the xyliton product. With the method that hemicellulose in the liquid waste of the regenerated cellulose fiber production or papermaking is taken as the raw material, source of the raw material of the xylitol is expanded, and full utilization of the resource is realized; a conventional pretreatment process of the xylitol is omitted, and the problem about pollution caused by acidic water and waste sludge discharge is solved.

Description

technical field [0001] The invention relates to the technical field of xylitol production, in particular to a method for producing xylitol by using hemicellulose extracted from regenerated cellulose fiber production or papermaking waste liquid as a raw material. Background technique [0002] Xylitol is a normal intermediate of carbohydrate metabolism in the human body, and it also exists widely in nature, especially in vegetables, fruits, mushrooms and other plants, but the content is low, and the cost of directly extracting xylitol from natural products is expensive, so The production methods of commercial xylitol at home and abroad all use xylan-containing plant raw materials, such as corncobs, bagasse, birch, etc., first hydrolyze the xylan in the raw materials into xylose, and then hydrogenate the xylose Reduction, crystallization xylitol is obtained after crystallization. Xylose and xylitol have been produced in my country for more than 40 years. Through the joint effo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/14C07C31/18
CPCC07C29/14C13K13/002C07C31/18
Inventor 陈学江于捍江么志高郑东义周殿朋庞艳丽韦吉伦尹国彬张荣生张卫民王怀宝
Owner 唐山三友集团兴达化纤有限公司
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