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Xylose production process

A production process and technology of xylose, applied in the production of sugar, sugar production, food science and other directions, can solve the problems of poor crystal form of xylose, low purity of xylose, no crystal luster, etc., and achieve low content of miscellaneous sugars. , the process is simple, the effect of simplifying the process

Inactive Publication Date: 2014-09-03
山东福田科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the traditional production process of xylose is made by direct hydrolysis of natural plants such as corncobs and birch bark. The purity of xylose in the liquid is low, the cost of refining and purification is high, and the xylose crystals produced have poor crystal form and no crystal luster

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. Concentrated alkali recovery: Take 8000g of viscose fiber wastewater with an alkali mass fraction of 20%, pass it through a nano-scale microporous membrane filter, and collect about 1000g of hemicellulose concentrated alkali solution that fails to pass through the filter; the permeate is concentrated Alkali solution, which can be used in the impregnation step in the viscose fiber production process;

[0025] 2. Dilute alkali recovery: add purified water to the hemicellulose concentrated alkali solution and continue to pass through the nano-scale microporous membrane filter, collect the retentate to obtain 1000g of hemicellulose dilute alkali solution with an alkali mass fraction of 0.5%; the permeate is Dilute alkali solution can be used for ion exchange resin alkali regeneration in step 7;

[0026] 3. Hydrolysis: Add 42.5g of 98% concentrated sulfuric acid to the hemicellulose dilute alkali solution, stir evenly, and hydrolyze for 100min at a temperature of 120°C to...

Embodiment 2

[0035] 1. Concentrated alkali recovery: take 8t of viscose fiber wastewater with an alkali mass fraction of 18%, pass it through a nano-scale microporous membrane filter, and collect about 1.2t of hemicellulose concentrated alkali solution that fails to pass through the filter; the permeate is Concentrated alkali solution, which can be used in the impregnation step in the viscose fiber production process;

[0036] 2. Dilute alkali recovery: add purified water to the hemicellulose concentrated alkali solution and continue to pass through the nano-scale microporous membrane filter to collect the retentate to obtain 1t of hemicellulose dilute alkali solution with an alkali mass fraction of 0.3%; the permeate is Dilute alkali solution can be used for ion exchange resin alkali regeneration in step 7;

[0037] 3. Hydrolysis: Add 35kg of 95% concentrated sulfuric acid to the hemicellulose dilute alkali solution, stir evenly, and hydrolyze at a temperature of 125°C for 80 minutes to o...

Embodiment 3

[0046] 1. Concentrated alkali recovery: take 0.3t of viscose fiber wastewater with an alkali mass fraction of 25%, pass it through a nano-scale microporous membrane filter, and collect about 0.04t of hemicellulose concentrated alkali solution that fails to pass through the filter; the permeate That is, concentrated alkali solution, which can be used in the impregnation step in the production process of viscose fiber;

[0047] 2. Dilute alkali recovery: add purified water to the hemicellulose concentrated alkali solution and continue to pass through the nano-scale microporous membrane filter, collect the retentate to obtain 0.032t of hemicellulose dilute alkali solution with an alkali mass fraction of 0.8%; the permeate That is dilute alkali solution, can be used for ion exchange resin alkali regeneration in the step 7;

[0048] 3. Hydrolysis: Add 5kg of 98% concentrated sulfuric acid to the hemicellulose dilute alkali solution, stir evenly, and hydrolyze for 170min at a temperat...

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Abstract

The invention provides a xylose production process, comprising the following steps: by taking viscose fiber waste water as a raw material, carrying out alkali recovery, acidolysis, edulcoration, strong liquor recovery, decoloration, desalination, sulfuric acid recovery, concentration, crystallization, baking and the like to prepare xylose. Firstly, suspended solid and impurities in hydrolysate are removed by adopting a two-stage microporous membrane filter, so that the problems that the suspended solid and impurities are large in amount and difficult to filter in the viscose fiber waste water are solved, and the obtained xylose is small in miscellaneous sugar content and simple in process. Secondly, the original acid-base consumption is converted into electricity consumption by using a bipolar membrane ion exchanger, the acid and alkali pollution emission is greatly reduced, the purity of xylose in the desalted liquid is over 85%, and the high-concentration xylose concentrate can be obtained just by concentrating once time to crystallize after being desalted.

Description

technical field [0001] The invention belongs to the field of functional sugar production, and in particular relates to a xylose production process. Background technique [0002] Xylose is a naturally occurring pentose sugar, mostly present in plants in a polycondensed state. In China, corn cob is the main raw material for xylose production, but corn cob is also widely used in other fields, which makes the supply of raw materials in short supply, and the price keeps rising, which increases the cost of xylose production. In this context, there is an urgent need to seek other corncob substitutes. [0003] At present, in the production process of viscose fiber, the dissolving pulp is usually impregnated with concentrated alkali to dissolve the hemicellulose, and then the short fiber and the hemicellulose alkali solution are separated by pressing. When the hemicellulose content is low, the hemicellulose The plain alkali solution is circulated for impregnation and dissolution un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00
Inventor 孙鲁田强王成福李毅邱学良曹玉华梁学超
Owner 山东福田科技集团有限公司