Method for producing xylose by using eucalyptus pulp pre-hydrolyzing liquid

A pre-hydrolyzate and pulping technology, applied in the production of sugar, sugar production, application and other directions, can solve the problems of non-discovery, waste of hemicellulose resources, environmental pollution, etc., and achieve the effect of solving the difficult problem of processing

Inactive Publication Date: 2012-07-25
FUTASTE PHARM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the calorific value of hemicellulose is lower than that of lignin, the prehydrolyzed solution is difficult to use, so generally the prehydrolyzed solution and black liquor are mixed and burned together with lignin, which will cause a serious waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Concentration: Concentrate the eucalyptus pulp prehydrolyzate with a refractive concentration of 4% to obtain a concentrated solution with a concentration of 8%;

[0023] (2) Hydrolysis: adding sulfuric acid to the concentrated solution with a concentration of 8%, adjusting the concentration of inorganic acid in the concentrated solution to 0.8%, and then hydrolyzing the concentrated solution at a hydrolysis temperature of 95°C and a hydrolysis time of 100 minutes to obtain a hydrolyzed solution;

[0024] (3) Neutralization: Add a certain amount of light calcium carbonate to the hydrolyzate at 80°C for neutralization while stirring. The neutralization end point is pH 2.5, and the addition time of light calcium carbonate is 45 minutes; After the addition, the hydrolyzed solution was stirred and kept at 80°C for 60 minutes, and finally filtered to obtain the neutralized solution;

[0025] (4) Decolorization: Add powdered activated carbon to the neutralization solution...

Embodiment 2

[0032] (1) Concentration: Concentrate the eucalyptus pulp prehydrolyzate with a refractive concentration of 7% to obtain a concentrated solution with a concentration of 25%;

[0033] (2) Hydrolysis: Add sulfuric acid to the concentrated solution with a concentration of 25%, adjust the concentration of inorganic acid in the concentrated solution to 1.0%, and then hydrolyze the concentrated solution at a hydrolysis temperature of 120°C and a hydrolysis time of 120 minutes to obtain a hydrolyzed solution ;

[0034] (3) Neutralization: Add a certain amount of light calcium carbonate to the hydrolyzate at 80°C for neutralization while stirring. The neutralization end point is pH 3.0, and the addition time of light calcium carbonate is 50 minutes; After the addition, the hydrolyzed solution was stirred and kept at 80°C for 50 minutes, and finally filtered to obtain the neutralized solution;

[0035] (4) Decolorization: Add powdered activated carbon to the neutralization solution, t...

Embodiment 3

[0042] (1) Concentration: Concentrate the eucalyptus pulp prehydrolyzate with a refractive concentration of 8% to obtain a concentrated solution with a concentration of 40%;

[0043] (2) Hydrolysis: Add sulfuric acid to the concentrated solution with a concentration of 40%, adjust the concentration of inorganic acid in the concentrated solution to 1.2%, and then hydrolyze the concentrated solution at a hydrolysis temperature of 120°C and a hydrolysis time of 120 minutes to obtain a hydrolyzed solution ;

[0044] (3) Neutralization: Add a certain amount of light calcium carbonate to the hydrolyzate at 80°C for neutralization while stirring. The neutralization end point is pH 3.1, and the addition time of light calcium carbonate is 60 minutes; After the addition, the hydrolyzed solution was stirred and kept at 80°C for 60 minutes, and finally filtered to obtain the neutralized solution;

[0045] (4) Decolorization: Add powdered activated carbon to the neutralization solution, t...

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Abstract

The invention discloses a method for producing xylose by using eucalyptus pulp pre-hydrolyzing liquid and belongs to the technical field of the production of functional sugars. The eucalyptus pulp pre-hydrolyzing liquid serves as a raw material and is prepared into the xylose through the procedures of pre-concentration, hydrolyzation, neutralization, decoloring, ion exchange, concentration, crystallization and drying processes. The reasonable utilization of eucalyptus pulp pre-hydrolyzing liquid is realized, the problem about treatment on the pre-hydrolyzing liquid in the eucalyptus pulp industry is solved, waste is changed into useful things, xylose products with multiple physiological functions are extracted from the pre-hydrolyzing liquid, the vacancy of producing the xylose by using the eucalyptus pulp pre-hydrolyzing liquid in China is filled, and a new raw material way for xylose production is made.

Description

technical field [0001] The invention belongs to the technical field of functional sugar production. Background technique [0002] Xylose is a naturally occurring pentose sugar that exists in plants in a polycondensed state. The finished xylose is white crystal or crystalline powder, easily soluble in water. Xylose is not digested and absorbed, and has no energy value; it activates bifidobacteria in the human intestinal tract and promotes their growth; it is not used by microorganisms in the oral cavity, and has some physiological functions of dietary fiber, which can reduce serum cholesterol and prevent intestinal cancer, etc. ; Simultaneous intake of xylose and calcium can improve the absorption rate and retention rate of calcium in the human body; it can prevent constipation and other physiological functions. Xylose is widely used in the manufacture of xylitol; food, beverages; pet feed; baked products; high-grade soy sauce color; light industry, chemical industry, etc. ...

Claims

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Application Information

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IPC IPC(8): C13K13/00
Inventor 孙鲁张念强李林郭艳敏庞颂李毅
Owner FUTASTE PHARM CO LTD
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