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Process for effectively hydrolyzing cellulose in ion liquid

An ionic liquid, a technology for dissolving cellulose, applied in the field of high-efficiency hydrolysis of cellulose, can solve the problems of troublesome post-processing of hydrolyzate, strong corrosiveness of concentrated acid, difficult recovery, etc., and achieves easy tracking and control, low corrosion resistance requirements , the effect of simple process

Inactive Publication Date: 2008-10-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concentrated acid hydrolysis of cellulose can be realized at lower temperature and normal pressure, but this method also has a series of defects: strong corrosiveness of concentrated acid, troublesome post-treatment of hydrolyzate, high acid consumption, difficult recovery, etc.
We believe that the traditional cellulose hydrolysis method is not efficient, the main reason is the lack of solvents that can fully dissolve the cellulose molecules

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 4 g of ionic liquid BMImCl into a 10 ml round bottom flask, heat to 100 °C, slowly add 0.32 g of Cellulose (Sigma Company, product number: S6790), stirred until all the cellulose was completely dissolved, and the solution was a clear amber homogeneous system. At this time, 0.063 grams of water and 0.148 grams of concentrated sulfuric acid (98 wt%) were mixed and quickly added to the solution, and reacted at 100° C. under normal pressure for a certain period of time. After the reaction is finished, quench the reaction with cold water, adjust the pH value of the reaction solution to 7.0 with 0.5 mol / L NaOH, measure the glucose content of the obtained hydrolyzate with a glucose analyzer, and measure the total reducing sugar content with the DNS method. According to the reaction of this method for 28 minutes and 45 minutes, the corresponding reducing sugar yields are respectively 66% and 62%, and the corresponding glucose yields are respectively: 28% and 38%.

Embodiment 2～3

[0023] Other process conditions and experimental steps are the same as in Example 1, but using different qualities of concentrated sulfuric acid (98wt%) as a catalyst, the reaction is quenched at different times, and the results are shown in Table 1.

[0024] Table 1 The results of cellulose hydrolysis reaction catalyzed by different quality catalysts

[0025] project

Embodiment 4～5

[0027] Other process conditions and experimental steps are with embodiment 1, but use different quality Cellulose was sampled and analyzed at different times, and the results of hydrolysis are shown in Table 2. It is proved that under the condition that the cellulose can be fully dissolved, the dissolved amount has no obvious influence on the hydrolysis result.

[0028] Table 2 The influence of the dissolved amount of cellulose in ionic liquid on the result of hydrolysis reaction

[0029] project

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Abstract

The invention relates to cellulosic hydrolysis, in particular to a method for high-efficiently hydrolyzing celluloses in ionic liquid. In the method, the ionic liquid in which celluloses are dissolved is used as solvent, and water, the equivalent weight of which is more than or equal to 1 mol, is used as reactant, and inorganic acids, the catalytic amount of which is the stoichiometric amount, are used as catalyst, and celluloses are reacted under the conditions of the normal pressure and the temperature of between 70 to 100 DEG C for 2min to 9hr; after the reaction is over, celluloses undergo the cold water quenching reaction and the alkali neutralization reaction, and the cellulose hydrolysate is obtained; total reducing sugar and glucose in the cellulose hydrolysate are taken with quantitative chemical analysis, and results of which show that the highest yield of reducing sugar is 73 percent, and correspondingly the yield of glucose is 53 percent. Compared with the conventional hydrolysis method, the method of the invention has the advantages of unnecessary pretreatment, mild reaction conditions, high hydrolytic activity, quick reaction speed, little acid consumption, low requirement on corrosion resistance of a reactor and easy tracking and controlling of the extent of reaction; the method opens a new road for resolving the lasting problem of the complete utilization of lignocelluloses.

Description

technical field [0001] The invention relates to the hydrolysis of cellulose, specifically a method for efficiently hydrolyzing cellulose in an ionic liquid, using an ionic liquid with good solubility for cellulose as a solvent, and efficiently hydrolyzing cellulose under the catalysis of an inorganic acid , the method of obtaining soluble sugar. Background technique [0002] The sustainable development of human society has higher and higher requirements on the environmental friendliness and reusability of energy. Cellulose is the most abundant renewable natural polymer on the earth. It contains about 10% to 25% in herbs, 40% to 53% in wood, 60% to 85% in bast such as flax, and fiber in cotton. The cellulose is as high as 90%; the carbon constituting cellulose in natural organisms accounts for about 40%, and the cellulose produced by photosynthesis reaches more than 100 billion tons every year. It can be said that cellulose is an inexhaustible and inexhaustible renewable re...

Claims

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Application Information

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IPC IPC(8): D21C5/00B01D15/36
Inventor 赵宗保李昌志
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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