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Refining method of xylose in hemicellulose hydrolysate

A technology of hemicellulose and refining method, which is applied in the field of chemical production to achieve the effects of simple operation, increasing product income and reducing production cost

Active Publication Date: 2019-04-05
SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there have been no reports on the recovery of sulfuric acid and high-purity acetic acid by nanofiltration membranes, electrodialysis coupled with extraction and rectification

Method used

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  • Refining method of xylose in hemicellulose hydrolysate
  • Refining method of xylose in hemicellulose hydrolysate
  • Refining method of xylose in hemicellulose hydrolysate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The hemicellulose hydrolyzate is passed through a high-speed disc centrifuge to separate solid impurities. The aqueous phase is composed of 2% sulfuric acid, 1.5% acetic acid, and 15% xylose, and then passes through Da2000 ultrafiltration membrane to remove lignin and macromolecular substances. Obtain the permeate solution containing xylose, sulfuric acid and acetic acid; the permeate solution containing xylose, sulfuric acid and acetic acid passes through the Da500 nanofiltration membrane to intercept sulfate ions, and the sulfuric acid concentration obtained is 5%, which is directly reused; The osmotic membrane is concentrated to a concentration of 10% for reuse; the nanofiltration permeate is separated from acetic acid and xylose in the biomass hydrolyzate by a homogeneous membrane electrodialysis method. According to the difference in the physical and chemical properties of the sulfuric acid and acetic acid ions, under the action of a direct current electric field, t...

Embodiment 2

[0041] The hemicellulose hydrolyzate is passed through a high-speed disc centrifuge to separate solid impurities, and the water phase is composed of 2% sulfuric acid, 1.5% acetic acid, and 15% xylose, and then passes through a Da1000 ultrafiltration membrane to remove lignin and macromolecular substances The permeate containing xylose, sulfuric acid and acetic acid is obtained; the permeate is passed through a Da500 nanofiltration membrane to intercept sulfate ions, and the sulfuric acid concentration obtained is 5%, which is directly reused; Use; nanofiltration permeate with homogeneous membrane electrodialysis to separate acetic acid and xylose in biomass hydrolyzate. According to the difference in the physical and chemical properties of the sulfuric acid and acetic acid ions, under the action of a direct current electric field, the device is called the treatment chamber between the anion exchange membrane and the cation exchange layer, and the acid recovery chamber between t...

Embodiment 3

[0044] Pass the hemicellulose hydrolyzate through a high-speed disc centrifuge to separate solid impurities. The water phase is composed of 2% sulfuric acid, 1.5% acetic acid, and 15% xylose, and then pass through Da1000 ultrafiltration membrane to remove lignin and macromolecular substances. Obtain the permeate containing xylose, sulfuric acid and acetic acid; the permeate passes through the Da500 nanofiltration membrane to intercept sulfate ions, and the mass concentration of the obtained sulfuric acid is 5%, which can be directly reused; or concentrated to 10wt by reverse osmosis membrane The % concentration is reused; the nanofiltration permeate is separated from acetic acid and xylose in the biomass hydrolyzate by homogeneous membrane electrodialysis. According to the difference in the physical and chemical properties of the sulfuric acid and acetic acid ions, under the action of a direct current electric field, the device is called the treatment chamber between the anion ...

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Abstract

The invention relates to the technical field of chemical engineering production, in particular to a refining method of xylose in hemicellulose hydrolysate. The method comprises the following steps of(1) removing impurities from the hemicellulose hydrolysate; feeding the hemicellulose hydrolysate into an ultrafiltration membrane to obtain transmission liquid; (2) separating the transmission liquidby the nanofiltration membrane; remaining sulfuric acid into concentrated liquid, wherein the transmission liquid contains acetic acid and xylose; (3) performing electrodialysis separation on aceticacid and xylose water solution; (4) directly using the xylose water solution for furfural production; (5) performing extraction and rectification on the acetic acid by solvents to obtain acetic acid with the concentration being 98.5 percent. The method has the advantages that the operation is simple; the obtained xylose water solution can be directly used for the furfural production; the acetic acid with the mass concentration being about 20 percent can be obtained; a solvent extraction rectification device is used for extraction separation to obtain the acetic acid with the mass concentrationbeing 98.5 percent. In the process, the separated sulfuric acid returns to the hydrolysis work procedure to be continuously used; active ingredients are recovered and reused; the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for refining xylose in hemicellulose hydrolyzate. Background technique [0002] At home and abroad, sulfuric acid is often used as a catalyst for cellulose hydrolysis to produce xylose. The traditional method is to neutralize the hydrolyzate with lime to meet the needs of the fermentation liquid for pH. However, because sulfuric acid cannot be recycled, and a large amount of calcium sulfate solid waste is generated, it is difficult to handle. So this method is not the best choice. At the same time, the by-product acetic acid in the reaction solution is not recovered, which wastes resources and causes environmental pollution. [0003] Since the boiling point of acetic acid is only 118.1°C, which is close to the boiling point of water at 100°C, and the two are still non-ideal systems, therefore, to obtain high-purity acetic acid with a low-concentration dilut...

Claims

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Application Information

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IPC IPC(8): C07H3/02C07H1/06C13K13/00
CPCC07H1/06C07H3/02C13K13/002
Inventor 郭志刚唐印雷林刘朝慧李旭初李刚王明权
Owner SICHUAN GOLDEN ELEPHANT SINCERITY CHEM CO LTD
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