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Method for producing high-purity crystallized xylose by hydrolyzing corn skin

A corn husk, high-purity technology, applied in the preparation of sugar derivatives, chemical instruments and methods, monosaccharides, etc., can solve the problems of increasing the burden of three wastes treatment, affecting the quality of finished products, and low purity of xylose, and reducing production costs. and environmental pollution, conducive to popularization, and the effect of reasonable and feasible process technology

Inactive Publication Date: 2010-01-06
SHANDONG LUZHOU FOOD GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If concentrated recovery is adopted, a large amount of steam will be consumed, which is uneconomical in terms of cost; so at present, it is directly discharged as wastewater, which not only causes huge waste, but also pollutes the environment and increases the burden of three wastes treatment
[0003] When using corn bran hydrolysis to prepare high-purity crystalline xylose, because the corn bran hydrolyzate contains xylose, glucose, arabinose and other small amounts of components, when it is directly used for crystallization, the quality of the finished product will be affected due to the low purity of xylose, while Ordinary refining methods are difficult to achieve further separation

Method used

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  • Method for producing high-purity crystallized xylose by hydrolyzing corn skin

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: process flow chart as attached figure 1 shown.

[0029] The method for preparing high-purity crystalline xylose by hydrolyzing corn hulls, the steps are as follows:

[0030] (1) corn husk dry matter amount 2kg, obtain xylose hydrolyzate with 110 ℃ of boiling hydrolysis of 1.5% sulfuric acid 4.5 hours, this xylose hydrolyzate concentration is 7.6%, the hydrolysis of xylose hydrolyzate dissolves total reducing sugar 61%wt( Based on dry solid), the xylose purity is 64.5% (based on dry solid);

[0031] (2) Separating the sulfuric acid in the final hydrolyzate with a simulated moving bed, the separation yield is 91.4%, and the pH value of the sugar solution after separation is 4.6, and then pre-concentrated to a concentration of 25.3% with a three-effect falling film evaporator to obtain concentrated solution I, wood Sugar purity 66.5% (based on dry solids);

[0032] (3) The above-mentioned concentrated solution I was decolorized by adding 3.5% activated car...

Embodiment 2

[0036] Embodiment 2: process flow chart as attached figure 1 As shown, the specific steps are:

[0037] (1) 2 kg of dry matter of corn hulls was hydrolyzed with 2.0% hydrochloric acid at 120° C. for 5 hours to obtain a xylose hydrolyzate, the concentration of the hydrolyzate was 8.7%, 62.4% of the total reducing sugar was dissolved by hydrolysis, and the purity of xylose was 65.7%;

[0038] (2) Separating the hydrochloric acid in the final hydrolyzate with a simulated moving bed, the separation yield is 91.4%, the pH value of the sugar solution after separation is 6.1, and then pre-concentrated to a concentration of 26.7% with a three-effect evaporator to obtain concentrated solution I, xylose purity 68.3%;

[0039] (3) The above-mentioned concentrated solution I was decolorized by adding activated carbon with a mass of 4.0% xylose in the solution at a temperature of 78° C. for 45 minutes;

[0040] (4) Implement continuous ion exchange operation through cation and anion exch...

Embodiment 3

[0043] Embodiment 3: process flow chart as attached figure 1 As shown, the specific steps are:

[0044] (1) 2 kg of dry matter of corn husks was boiled and hydrolyzed with 2.0% sulfuric acid at 116°C for 3 hours to obtain a xylose solution. The concentration of the solution was 8.3%, 60.3% of total reducing sugars were dissolved by hydrolysis, and the purity of xylose was 65.4%;

[0045] (2) Separating the sulfuric acid in the final hydrolyzate with a simulated moving bed, the separation yield is 91.4%, the pH value of the sugar solution after separation is 4.9, and then pre-concentrated to a concentration of 26.1% with a three-effect evaporator to obtain concentrated solution I, xylose purity 68.7%;

[0046] (3) The above-mentioned concentrated solution I was decolorized by adding 5.0% activated carbon relative to the xylose mass in the solution at a temperature of 79° C. for 30 minutes;

[0047] (4) Implement continuous ion exchange operation through cation and anion excha...

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Abstract

A process for preparing high-purity xylose crystal by hydrolyzing corn peel includes such steps as boiling hydrolyzing with sulfuric acid or hydrochloric acid at 105-125 deg.C, separating and recovering the sulfuric acid or hydrochloric acid from the hydrolyte by analog moving-bed, decoloring, refining by ion exchange, purifying by analog moving-bed, and crystallizing in thee-effect evaporator.

Description

technical field [0001] The present invention relates to a technology for preparing high-purity crystallized xylose, more precisely, a technology for separating and recovering dilute acid, separating and purifying xylose and preparing high-purity crystallized xylose by using corn bran hydrolyzate through a simulated moving bed . Background technique [0002] During the hydrolysis of corn hulls, a dilute acid solution with a concentration of less than 0.2-2.5% is produced. If concentrated recovery is used, a large amount of steam will be consumed, which is not cost-effective; so at present, it is directly discharged as wastewater, which not only causes huge waste, but also pollutes the environment and increases the burden of three wastes treatment. [0003] When using corn bran hydrolysis to prepare high-purity crystalline xylose, because the corn bran hydrolyzate contains xylose, glucose, arabinose and other small amounts of components, when it is directly used for crystalli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07H3/02C07H1/06
Inventor 王德友葛建亭赵玉斌牛继星李法田高中法
Owner SHANDONG LUZHOU FOOD GROUP
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