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Method for preparing xylose by using squeezed waste alkali in viscose fiber production process

A technology for squeezing waste caustic soda and production process, applied in sugar production, sugar production, application, etc., can solve the problems of shortage of bamboo and other raw materials, low utilization rate of resources, etc., achieve complete hydrolysis, reduce operation steps and time short effect

Active Publication Date: 2012-08-22
YIBIN GRACE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention aims to solve the shortage of bamboo and other raw materials for xylose preparation in the prior art, the shortcomings of low resource utilization rate, and the social and environmental problems caused by the large amount of waste lye produced in the viscose fiber preparation process. The cellulose in the bamboo pulp is used to prepare viscose fiber, and the hemicellulose in the waste lye is dissolved as the raw material for the production of xylose, which provides a way for the raw material source of xylose, and also provides a way for the pressing waste in the production process of viscose fiber How to use lye to prepare xylose provides a new method to achieve the effect of waste reuse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A method for preparing xylose by pressing waste lye in the viscose fiber production process, comprising the following process steps:

[0058] A, the preparation of hemicellulose solution: the waste lye of pressing that contains alkali and hemicellulose is passed through prefiltration, precision filtration and membrane filtration successively, obtains permeate and concentrated lye, and the alkali content in the concentrated lye is 120g / L, the hemicellulose content is 40g / L;

[0059] B, the extraction of hemicellulose: with the concentrated lye obtained in step A, adjust the pH value of the supernatant to 4 with 98.5% concentrated sulfuric acid at room temperature, then add 95% industrial ethanol of 2 times the volume of the concentrated lye , let stand to precipitate, filter, wash with 95% industrial ethanol of 0.5 times the volume of concentrated lye, and dry to constant weight at a vacuum of 0.08Mpa and a drying temperature of 60°C to obtain a white hemicellulose powd...

Embodiment 2

[0075] A method for preparing xylose by pressing waste lye in the viscose fiber production process, comprising the following process steps:

[0076] A, the preparation of hemicellulose solution: the waste lye of pressing that contains alkali and hemicellulose is passed through pre-filtration, precision filtration and membrane filtration successively, obtains permeate and concentrated lye, and the alkali content in the concentrated lye is 230g / L, the hemicellulose content is 70g / L;

[0077] B, the extraction of hemicellulose: with the concentrated lye obtained in step A, adjust the pH value of the supernatant with 98.5% concentrated sulfuric acid at room temperature, then add 95% industrial ethanol of 3 times the volume of the concentrated lye , let stand to precipitate, filter, wash with 95% industrial ethanol of 1 volume of concentrated lye, and dry to constant weight at a vacuum of 0.1Mpa and a drying temperature of 80°C to obtain a white hemicellulose powder;

[0078] C, ...

Embodiment 3

[0093] A method for preparing xylose by pressing waste lye in the viscose fiber production process, comprising the following process steps:

[0094] A, the preparation of hemicellulose solution: the waste lye of pressing that contains alkali and hemicellulose is passed through pre-filtration, precision filtration and membrane filtration successively, obtains permeate and concentrated lye, and the alkali content in the concentrated lye is 175g / L, the hemicellulose content is 55g / L;

[0095]B, the extraction of hemicellulose: with the concentrated lye obtained in step A, adjust the pH value of the supernatant to 4.5 with 98.5% concentrated sulfuric acid at room temperature, then add 95% industrial ethanol of 2.5 times the volume of the concentrated lye , let stand to precipitate, filter, wash with 95% industrial ethanol of 0.75 times the volume of concentrated lye, and dry to constant weight at a vacuum of 0.09Mpa and a drying temperature of 70°C to obtain a white hemicellulose...

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Abstract

The invention relates to a method for preparing xylose by using squeezed waste alkali in the viscose fiber production process. According to the method, xylose finished products are obtained through work procedures of hemicellulose solution preparation, hemicellulose extraction, hemicellulose hydrolysis, neutralization and deacidification, preconcentration, decoloration, ion exchange, ordinary concentration, crystallization, separation and drying. When the technical scheme provided by the invention is adopted, harmful environment-pollution substances such as waste alkali and waste water generated in the viscose production process can be thoroughly eliminated, the standard of full-flow-process clean production can be reached, viscose production enterprises can also produce xylose in the viscose production process, the goal of environment protection is reached, and meanwhile, the waste reutilization is also realized.

Description

technical field [0001] The invention relates to a method for preparing xylose, more specifically, the invention relates to a method for preparing xylose by using waste lye squeezed in the production process of viscose fiber. Background technique [0002] Xylose is a reducing sugar, a component of pentosan, and its molecular formula is C 5 h 10 o 5 . The sweetness of xylose is 72% of that of sucrose, which is close to the sweetness of glucose, and the flavor is also similar to that of glucose, which can improve the flavor and taste of sweets and suppress odor. Xylose can be hydrogenated and reduced in the presence of a catalyst to generate xylitol, which can be used as a raw material for xylitol. Xylose has good food compatibility, and it can easily produce Maillard reaction during mixing with amino acids during heating. Fragrance effect. Xylose also has good health care functions, can activate bifidobacteria in the human intestinal tract and promote their growth, improv...

Claims

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Application Information

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IPC IPC(8): C13K13/00
Inventor 王兵冯涛邓传东刘英赵红霞干友华
Owner YIBIN GRACE
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