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Method for preparing glucose through hydrolysis of cellulose

A technology for cellulose and glucose, applied in the field of glucose preparation, can solve the problems of long hydrolysis time, low reaction efficiency, difficult separation of catalyst and residue, etc., and achieves the effects of high hydrolysis efficiency, low content of by-products, and shortened hydrolysis time.

Inactive Publication Date: 2014-11-26
殷志杰
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of solid acid to hydrolyze cellulose has disadvantages such as difficult separation of catalyst and residue, long hydrolysis time, and low reaction efficiency, which limit the practical application of the above two acids

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 2% corn stalks and 1% weakly polar catalyst into water, the solvent ratio (non-polar: water) = 1:2, and hydrolyze at 160°C for 1 hour. Glucose was detected, and the hydrolysis effect of weak polar acid catalyst on microcrystalline cellulose was compared. The type of acid catalyst had a significant impact on the yield of glucose, and phthalic acid could obtain better results.

Embodiment 2

[0018] Add 2% tree powder and 1% phthalic acid into water, solvent ratio (non-polar: water) = 1:2, and hydrolyze for 2 hours at different temperatures. Glucose was detected, and the hydrolysis effect of phthalic acid on microcrystalline cellulose at different temperatures showed that the hydrolysis temperature had a significant impact on the yield of glucose. When the temperature is lower than 160℃, the yield of glucose increases with the increase of hydrolysis temperature; when the temperature is higher than 160℃, the yield of glucose tends to decrease. It shows that at a higher temperature, the conversion of the product glucose into hydroxymethylfurfural and other by-products is enhanced, which makes the glucose yield decrease instead. The solvent ratio had a significant effect on the glucose yield. When the water solvent is completely used, the glucose yield is relatively low, adding a non-polar solvent enhances the dissolution and dispersion of the catalyst, which can inc...

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PUM

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Abstract

The invention discloses a method for preparing glucose through hydrolysis of cellulose. The method is characterized by comprising the following steps: mixing water, a cellulose raw material, a non-polar solvent and a weakly-polar acid catalyst, then hydrolyzing the obtained mixture and separating an aqueous phase to obtain a glucose solution, wherein a non-polar phase is composed of the non-polar solvent and residual weakly-polar acid, and a filter residue is the non-hydrolyzed cellulose raw material; and supplementing water into the non-polar phase and the filter residue and repeating hydrolysis and separation. According to the invention, the weakly-polar acid and the cellulose raw material are made full use, reaction conditions are mild, energy consumption is low, and hydrolysis products and the catalyst can be easily separated; compared with solid acid hydrolysis, the invention has the advantages of greatly improved hydrolysis efficiency and shortened hydrolysis time.

Description

technical field [0001] The invention relates to a method for preparing glucose, in particular to a method for preparing glucose by hydrolyzing cellulose. Background technique [0002] The production of bioethanol is one of the main methods of biomass resource conversion and utilization, and the key step is how to hydrolyze the cellulose or hemicellulose in the fiber raw material into fermentable sugars. Compared with cellulase hydrolysis, the acid-catalyzed hydrolysis process has the advantages of low cost and easy control of reaction conditions, but there are also disadvantages in the acid-catalyzed hydrolysis process, including high equipment requirements, difficult wastewater treatment, complex hydrolyzed products, and difficult separation of catalysts. place. In order to solve the problem of complex products in the acid hydrolysis process, some researchers proposed to use organic acids such as formic acid or maleic acid to hydrolyze cellulose. Since organic acids are we...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K1/02
Inventor 不公告发明人
Owner 殷志杰
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