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Method for preparing xylose by hydrolyzing hemicellulose based on solid acid

A technology of hemicellulose and solid acid, applied in sugar production, xylose production, sugar production, etc., can solve problems such as separation difficulties, reduce safety risks, reduce production costs, and reduce corrosion

Active Publication Date: 2019-01-01
四川雅华生物有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] 1. Acid hydrolysis, such as CN106381348A using 0.1-0.5mol / L maleic acid solution, CN103103233A using 0.5-2.0% sulfuric acid solution for hydrolysis, CN102758028A using alkali oxygen (sodium hydroxide and hydrogen peroxide) pretreatment and dilute acid The combined method of hydrolysis process uses liquid acid treatment, the added acid will not be consumed as a catalyst, but it is difficult to separate when mixed in the hydrolyzate;

Method used

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  • Method for preparing xylose by hydrolyzing hemicellulose based on solid acid
  • Method for preparing xylose by hydrolyzing hemicellulose based on solid acid
  • Method for preparing xylose by hydrolyzing hemicellulose based on solid acid

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Effect test

Embodiment 1

[0050] A method for preparing xylose based on solid acid hydrolysis of hemicellulose, comprising the steps of:

[0051] A. preprocessing

[0052] The sodium hydroxide in the viscose wastewater is recovered by using the conventional nanofiltration technology in this field. After recovery, the viscose wastewater mainly contains hemicellulose and a small amount of sodium hydroxide; then, add sulfuric acid to the filtrate to adjust the pH to 5 to obtain Pretreatment solution, spare;

[0053] B. Feed

[0054] Add the pretreatment liquid obtained in step A into the injector, and heat it to 105°C by steam; then, under the condition of a pressure of 0.12MPa, feed the pretreatment liquid with a feed flow rate of 40m³ / h and a feed density of 1.04kg / L is added to the tank body 1 of the xylose preparation system;

[0055] After the pretreatment liquid enters the tank body 1 from the feed port 8, it is first filtered through the lower filter element 9, and then enters into the accomm...

Embodiment 2

[0061] A method for preparing xylose based on solid acid hydrolysis of hemicellulose, comprising the steps of:

[0062] A. preprocessing

[0063] The sodium hydroxide in the viscose wastewater is recovered by adopting the conventional nanofiltration technology in this field. After recovery, the viscose wastewater mainly contains hemicellulose and a small amount of sodium hydroxide; then, sulfuric acid is added to the filtrate to adjust the pH to 7 to obtain Pretreatment solution, spare;

[0064] B. Feed

[0065] Add the pretreatment liquid obtained in step A into the ejector, heat it to 108°C by steam; / L is added to the tank body 1 of the xylose preparation system;

[0066] After the pretreatment liquid enters the tank body 1 from the feed port 8, it is first filtered through the lower filter element 9, and then enters into the accommodation chamber 4 provided with solid acid; and the filter residue generated in the filtration is transported to the sedimentation tank, f...

Embodiment 3

[0072] A method for preparing xylose based on solid acid hydrolysis of hemicellulose, comprising the steps of:

[0073] A. preprocessing

[0074] The sodium hydroxide in the viscose wastewater is recovered by adopting the conventional nanofiltration technology in the field. After recovery, the viscose wastewater mainly contains hemicellulose and a small amount of sodium hydroxide; then, sulfuric acid is added to the filtrate to adjust the pH to 6 to obtain Pretreatment solution, spare;

[0075] B. Feed

[0076] Add the pretreatment liquid obtained in step A into the ejector, heat it to 106°C by steam; / L is added to the tank body 1 of the xylose preparation system;

[0077] After the pretreatment liquid enters the tank body 1 from the feed port 8, it is first filtered through the lower filter element 9, and then enters into the accommodation chamber 4 provided with solid acid; and the filter residue generated in the filtration is transported to the sedimentation tank, fo...

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Abstract

The invention discloses a method for preparing xylose by hydrolyzing hemicellulose based on solid acid and belongs to the technical field of greenness and environment protection of biomass utilization. The method comprises the following steps: firstly, carrying out pre-treatment on viscose wastewater and removing surplus alkali; recycling sodium hydroxide and regulating the pH (Potential of Hydrogen); secondly, adding a pre-treatment solution into a tank body of a xylose preparation system through a spraying device; finally, hydrolyzing the hemicellulose into the xylose in the tank body underthe action of the solid acid and a catalyst. The preparation method is small in energy consumption; a final product xylose contains less acid and additional acid is not needed, so that the method is applicable to industrial mass production; meanwhile, the solid acid and the catalyst can be cyclically utilized and do not enter discharged hydrolysate; a preparation technology of the xylose is convenient to control.

Description

technical field [0001] The invention relates to a method for preparing xylose based on solid acid hydrolysis of hemicellulose, in particular to a method for preparing xylose based on solid acid hydrolysis of hemicellulose in viscose wastewater, and belongs to the field of green environmental protection technology for biomass utilization . Background technique [0002] With the continuous development of the world economy, the continuous growth of population and the massive consumption of petrochemical resources, problems such as energy shortage and environmental degradation have become increasingly prominent and intensified. Biomass resources are abundant renewable resources on the earth. They have the advantages of wide sources, low cost, clean and renewable. The research on the conversion of biomass to produce biomass energy has attracted extensive attention. Lignocellulosic biomass is mainly composed of cellulose, hemicellulose and lignin, among which the content of hemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00
CPCC13K13/002
Inventor 徐小荣邓传东陈德水莫世清黄钱威唐孝兵吴限智李哲
Owner 四川雅华生物有限公司