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Method for preparing reducing sugar by catalyzing hydrocellulose

A technology for catalytic hydrolysis and cellulose, applied in sugar production, monosaccharide, chemical recovery, etc., can solve the problems of non-green, high equipment requirements, etc., and achieve the effect of stable performance and simple synthesis method

Inactive Publication Date: 2009-08-26
青岛生物能源与过程研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the catalytic hydrolysis of cellulose with inorganic acids has the following disadvantages: the catalyst is a strong acid, which is a non-green catalyst
Liquid acid catalysts are corrosive and require high equipment

Method used

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  • Method for preparing reducing sugar by catalyzing hydrocellulose
  • Method for preparing reducing sugar by catalyzing hydrocellulose
  • Method for preparing reducing sugar by catalyzing hydrocellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In a three-neck flask equipped with a thermometer and a magnetic stirrer, add 4 g of ionic liquid [C 4 mim] C1, heated to 100°C in an oil bath to dissolve. Then add 0.32 g of cellulose to make a uniform and transparent cellulose solution. 0.06 g of water and 0.32 g of acid-functionalized ionic liquid 1-methyl-3-(3-sulfopropyl)imidazolium bisulfate were added to the cellulose solution. React at 100°C for 2-4 hours. After the reaction is completed, water is added and filtered, and the filtrate is passed through an ion exchange resin column to separate the reducing sugar and the ionic liquid. The cellulose conversion rate was 81.3%. The yield of reducing sugar was 79.6%.

Embodiment 2

[0035] In a three-neck flask equipped with a thermometer and a magnetic stirrer, add 4 g of ionic liquid [C 4 mim]C1, microwave heating to 100 ℃ to dissolve. Then add 0.80 g of cellulose to make a uniform and transparent cellulose solution. 0.20 g of water and 0.80 g of acid-functionalized ionic liquid 1-methyl-3-(3-sulfopropyl)imidazolium bisulfate were added to the cellulose solution. React under microwave heating conditions for 10-15 minutes. After the reaction is completed, water is added and filtered, and the filtrate is passed through an ion exchange resin column to separate the reducing sugar and the ionic liquid. The cellulose conversion rate was 89.2%. The yield of reducing sugar was 85.6%.

Embodiment 3

[0037] In a three-neck flask equipped with a thermometer and a magnetic stirrer, add 8 grams of ionic liquid [C 4 mim] C1, heated to 100°C in an oil bath to dissolve. Then add 0.60 g of cellulose to make a uniform and transparent cellulose solution. 0.12 g of water and 0.60 g of acid-functionalized ionic liquid 1-methyl-1-(3-sulfopropyl)morpholine hydrogensulfate were added to the cellulose solution. React at 100°C for 6-8 hours. After the reaction is completed, water is added and filtered, and the filtrate is passed through an ion exchange resin column to separate the reducing sugar and the ionic liquid. The cellulose conversion rate was 79.4%. The yield of reducing sugar was 74.2%.

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Abstract

The invention relates to a method for preparing reducing sugar by catalyzing hydrocellulose, which comprises the following steps: A) adding 40 to 50 portions of ionic liquid by weight, dissolving the ionic liquid at a temperature of between 80 and 100 DEG C, and adding 2 to 3.2 portions of cellulose by weight into the ionic liquid to obtain transparent cellulose solution; B) adding 0.6 to 1 portion of water and 2 to 3.2 portions of acid functional ionic liquid by weight as a catalyst into the cellulose solution prepared in step A, and reacting the mixture for 10 minutes to 8 hours at a temperature of between 100 and 120 DEG C; and C) filtering the reaction solution obtained in step B and removing the precipitated cellulose, and separating the reducing sugar and the ionic liquid from the filtrate through an ion exchange resin column, wherein the ionic liquid is 1-butyl-3-methylimidazole chlorine salt; and the acid functional ionic liquid consists of cations containing nitrogen heterocyclic compounds and anions. The method overcomes the defects that an acid catalyst cannot be recycled after the reaction is finished and erodes equipment.

Description

technical field [0001] The invention relates to a method for preparing reducing sugar by catalytically hydrolyzing cellulose. Background technique [0002] Cellulose is the most abundant renewable resource on earth, and has the advantages of being cheap, degradable and non-polluting to the ecological environment. Converting cellulose into energy, industrial raw materials, and fine chemicals is a better way to utilize cellulose resources and protect the environment. At present, the degradation of cellulose macromolecules has been a hot research topic, and the degradation methods include acid hydrolysis degradation, oxidative degradation, biodegradation, thermal degradation, mechanical degradation, ion radiation degradation and other ways. However, cellulose is a polymer compound with a linear structure connected by D-glucopyranose groups through 1-4B glycosidic bonds. Its structure is complex, and there are a large number of crystal regions, amorphous region structures and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K1/02C07H3/02
CPCY02P20/584
Inventor 咸漠张磊徐鑫杨建明孟鑫李强
Owner 青岛生物能源与过程研究所
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