Application of ionic liquid to preparation of reducing sugar by cellulose hydrolysis

A technology of ionic liquid and acidic ionic liquid, which is applied in the field of hydrolyzing cellulose, can solve the problems of inconvenient operation, high viscosity, and increased cost, and achieve the effects of convenient operation, fast reaction speed, and convenient industrial production

Inactive Publication Date: 2011-05-25
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the viscosity of [bmim]Cl is too high, and it is inconvenient to operate in industrial production. Although the co-solvent is added to reduce the viscosity, it also increases the cost

Method used

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  • Application of ionic liquid to preparation of reducing sugar by cellulose hydrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 15 grams of 1-ethyl-3-methylimidazole acetate into a round bottom flask, heat to 140°C, slowly add 0.6 grams of straw under vigorous stirring, stir until the straw is dissolved, and put 0.11 grams of Fe-containing 3+ aqueous solution (C (Fe3+) =0.025mol / L) and 0.6 gram of 1-methyl-3-(4-sulfonic acid butyl) imidazole bisulfate add reaction system, get a certain amount of reaction solution at regular intervals, quench the reaction with cold water, The pH of the reaction solution was adjusted to 7.0 with 0.5 mol / L NaOH, the supernatant was taken after centrifugation, and the total reducing sugar content was determined by DNS method. According to this method, the reaction time was 4h, and the yield of reducing sugar was 85%.

Embodiment 2～4

[0023] Other process conditions and experimental steps are the same as in Example 1, but using straws of different qualities and the mass of the catalyst being 150% of the mass of the corresponding straws, samples were taken at different times to measure reducing sugars, and the hydrolysis results are shown in Table 2. It proves that under the condition that the straw can be fully dissolved, its dissolved amount has basically no effect on the hydrolysis result.

[0024] Table 1 Effect of the amount of straw dissolved in ionic liquid on the hydrolysis results

[0025] project

Embodiment 5

[0027] Add 15 grams of 1-ethyl-3-methylimidazole acetate into a round bottom flask, heat to 140°C, slowly add 0.6 grams of straw under vigorous stirring, stir until the straw is dissolved, and put 0.11 grams of Fe-containing 3+ aqueous solution (C (Fe3+) =0.025mol / L) and 1.2 grams of 1-methyl-3-(4-sulfonic acid butyl) imidazolium bisulfate were added to the reaction system, and a certain amount of reaction solution was taken at regular intervals, and the reaction was quenched with cold water. The pH of the reaction solution was adjusted to 7.0 with 0.5 mol / L NaOH, the supernatant was taken after centrifugation, and the total reducing sugar content was determined by DNS method. According to this method, the reaction time was 3h, and the yield of reducing sugar was 89%.

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Abstract

The invention relates to dissolution of straws and hydrolysis of celluloses, in particular to a method for preparing reducing sugar by dissolving the straws and hydrolyzing the celluloses in ionic liquid. The method comprises the following steps of: adding 1-ethyl-3-methylimidazole acetate serving as a straw solvent into Fe3+-containing aqueous solution and reacting in the presence of acidic ionic liquid serving as a catalyst under normal pressure at the temperature of between 110 and 140 DEG C for 0.5 to 5 hours; quenching with cold water; neutralizing with alkali liquor to prepare cellulose hydrolyzate; and measuring reducing sugar content by a 3,5-dinitrosalicylic acid method, wherein the reducing sugar in the hydrolyzate and the ionic liquid can be separated by an ion exchange method and the ionic liquid can be repeatedly used. Experiment results show that the reducing sugar yield is up to 93 percent to the maximum extent. Compared with the conventional straw cellulose hydrolysis method, the method has the advantages of solving the problems of complicated pretreatment, low hydrolysis activity, high corrosion to equipment, high cellulose solvent viscosity, inconvenience of operation and the like and providing a new approach for full utilization of the straws.

Description

technical field [0001] The present invention relates to the dissolution of straw and the hydrolysis of cellulose. Specifically, the ionic liquid with good dissolving ability for straw is used as a solvent, and the 3+ Aqueous solution, hydrolysis of cellulose under the catalysis of acidic ionic liquid, the method of obtaining reducing sugar. Background technique [0002] Due to the massive and unrestrained use of fossil fuels, problems such as energy crisis and environmental degradation have been caused, and human beings are faced with dual pressures on energy and the environment. Therefore, human beings urgently need to find a green and environmentally friendly renewable energy source. my country's crop straw output is about 700 million tons per year, ranking first in the world. The main components of straw are cellulose, hemicellulose and lignin, which is a valuable renewable resource. At present, the main uses of straw in my country are papermaking, feed, field return an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C13K1/02C13K5/00C13K7/00C13K11/00
Inventor 王海军丁振东池珍顾圣明
Owner JIANGNAN UNIV
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