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Method for producing reducing sugar by cellulose

A technology of cellulose and catalyst, which is applied in the field of cellulose preparation of reducing sugar, can solve the problems of difficult separation of reducing sugar, high price of ionic liquid, and restriction of industrial application, etc., and achieve easy recycling, simple preparation, and good industrial application prospects Effect

Inactive Publication Date: 2015-03-25
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the price of ionic liquid is still high, and it is difficult to separate from reducing sugar, which limits the industrial application of this method

Method used

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  • Method for producing reducing sugar by cellulose
  • Method for producing reducing sugar by cellulose
  • Method for producing reducing sugar by cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Get cellulose (16.2g, 0.1mol), (C 1 IMPS) 3 PW 12 o 40 (34.9g, 0.01mol) and 162mL deionized water in a 1000mL or 5000mL temperature-controlled autoclave, vigorously mechanically stirred at 180°C for 1.5 hours, then cooled to 25°C, and filtered with a dry medium-speed filter paper of constant weight, And wash the filter paper with 162mL deionized water 3 times, the filtrate is fixed to 500mL, and the reducing sugar production rate is 34% as measured by the DNS method; the pH value is adjusted to 2.0 with concentrated hydrochloric acid, and the catalyst is separated out in solid form, filtered, dried, and recycled until In the next pot of reaction; remove the water in the filtrate under reduced pressure to obtain crude reducing sugar.

Embodiment 2

[0022] Get cellulose (16.2g, 0.1mol), (C 2 IMPS) 3 PW 12 o 40 (35.1g, 0.01mol) and 81mL deionized water in a 1000mL or 5000mL temperature-controlled autoclave, vigorously mechanically stirred at 200°C for 1 hour, then cooled to 25°C, and filtered with a dry medium-speed filter paper of constant weight. And wash filter paper with 162mL deionized water 3 times, filtrate is fixed to 500mL, and DNS method records reducing sugar production rate to be 39%; Adjust pH value to 2.0 with concentrated hydrochloric acid, catalyst is separated out in solid form, filters, dries, recycles until In the next pot of reaction; remove the water in the filtrate under reduced pressure to obtain crude reducing sugar.

Embodiment 3

[0024] Get cellulose (16.2g, 0.1mol), (C 16 IMPS) 3 PW 12 o 40 (37.0g, 0.01mol) and 1620mL deionized water in a 5000mL autoclave with temperature control, 250 ℃ vigorous mechanical stirring for 24 hours, then cooled to 25 ℃, filtered with constant weight dry medium speed filter paper, and 162mL Wash the filter paper 3 times with deionized water, and the filtrate was fixed to 5000mL. The yield of reducing sugar was 70% as measured by DNS method; the pH value was adjusted to 2.0 with concentrated hydrochloric acid, and the catalyst was precipitated in solid form, filtered, dried, and recycled to the next Pot reaction; remove the water in the filtrate under reduced pressure to obtain crude reducing sugar.

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Abstract

The invention relates to a method for producing reducing sugar by cellulose. The method is characterized in that catalyst 1-(3-sulfo group) propyl-3-alkyl imidazole phosphotungstate (called (CnIMPS) 3PW12040, n=1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14 and 16 as follows) promotes cellulose hydrolyzation in deionized water to obtain the reducing sugar. Used catalysts are recyclable transformable catalysts.

Description

technical field [0001] The invention belongs to the production technical field of utilization of biomass resources, and relates to a method for preparing reducing sugar from cellulose. technical background [0002] Cellulose is a linear natural polysaccharide macromolecular compound composed of glucose units connected by β-1,4-glucosidic bonds. The adjacent oxygen atoms and hydroxyl groups in the molecule produce strong hydrogen bonds, making the long-chain cellulose molecules The formation of a supramolecular stable structure with highly crystalline regions makes cellulose difficult to hydrolyze. [0003] The use of biomass cellulose to produce fuel ethanol is one of the hot topics that scientists from all over the world are competing to study. The key to biomass cellulose ethanol conversion technology is how to hydrolyze cellulose into fermentable reducing sugars. At present, the research on cellulose hydrolysis process mainly focuses on two ways: acid hydrolysis and enzy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K13/00
CPCC13K13/00
Inventor 李炜高伟夏咏梅方云
Owner JIANGNAN UNIV