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Method for preparing ethanol by one-step fermentation after ion liquid stage treatments from native cellulose material

A natural cellulose and ionic liquid technology, applied in the field of ethanol fermentation industry, can solve the problems of low ethanol production efficiency and achieve the effects of high ethanol recovery concentration, long-term continuous fermentation, and high feed concentration

Inactive Publication Date: 2008-11-05
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing ethanol by one-step fermentation of natural cellulose raw materials through ionic liquid graded treatment, solve a series of problems caused by mixed sugar fermentation, and finally solve the problem of low ethanol production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Crush a certain amount of corn stalks to 40 mesh, add the ionic liquid 1-methyl-3-(phenylsulfonic acid group) methylimidazole chloride (acidic) according to the mass ratio of 1:6, soak at 80 ° C 4 hours. The raw material is partially dissolved and centrifuged to obtain a solid whose main components are cellulose and lignin. The hemifiber dissolved in the ionic liquid chloride 1-methyl-3-(phenylsulfonic acid group) methylimidazole can be precipitated by adding water and centrifuged; the ionic liquid chloride 1-methyl-3-( Phenylsulfonate)methylimidazole can be recycled by vacuum drying.

[0022] The solid matter containing cellulose and lignin was added to the ionic liquid 1-allyl-3-methylimidazole chloride at a mass ratio of 6:100, and heated in an oil bath at 110° C. for 2 hours. The solid is partially dissolved, and centrifuged to obtain a solid whose main component is lignin. The cellulose dissolved in the ionic liquid 1-allyl-3-methylimidazole chloride is precipit...

Embodiment 2

[0025] A certain amount of rice straw was crushed to 80 meshes, added into the ionic liquid N-methylimidazole methanesulfonate (acidic) at a mass ratio of 1:15, and soaked at 60° C. for 6 hours. The raw material is partially dissolved and centrifuged to obtain a solid whose main components are cellulose and lignin. The separation of hemicellulose and the recovery method of ionic liquid are the same as in Example 1.

[0026] The solid matter containing cellulose and lignin is added to the ionic liquid 1-butyl-3-methylimidazole chloride at a mass ratio of 1:5, and heated by microwave for 1 hour. The solid is partially dissolved, and centrifuged to obtain a solid whose main component is lignin. The separation of cellulose and the regeneration method of ionic liquid are the same as in Example 1.

[0027] The separated cellulose is mixed with water to prepare a mixed solution with a mass percentage of 40%, which is added to an air-lift reactor, and after sterilization, cellulase ...

Embodiment 3

[0029] A certain amount of wheat straw was crushed to 100 mesh, added to ionic liquid hydroxide 1-methyl-3-n-butylimidazole (alkaline) at a mass ratio of 1:10, and soaked at 80°C for 8 hours. The raw material is partially dissolved and centrifuged to obtain a solid whose main components are cellulose and lignin. The separation of hemicellulose and the recovery method of ionic liquid are the same as in Example 1.

[0030] The solid matter containing cellulose and lignin was added to the ionic liquid 1-butyl-3-methylimidazole bromide at a mass ratio of 6:100, and heated by microwave for 3 hours. The solid is partially dissolved, and centrifuged to obtain a solid whose main component is lignin. The separation of cellulose and the regeneration method of ionic liquid are the same as in Example 1.

[0031] The separated cellulose is mixed with water to prepare a mixed solution with a mass percentage of 20%, which is added to an air-lift reactor. After sterilization, cellulase is a...

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Abstract

The invention relates to a method that prepares ethanol through the grading processing with ionic liquids and one-step zymolysis and utilizes a raw material of native cellulose. The raw material of native cellulose is orderly processed by the ionic liquids A and B so as to respectively remove hemicellulose and lignin, and the obtained cellulose is used as a substrate so as to be further fermented to prepare the ethanol; the ionic liquid A is an acid or alkalic ionic liquid, the ionic liquid B is a halogenated-imidazole-like ionic liquid. The method utilizes the ionic liquids to implement the grading processing of the raw material of native cellulose, removes the substances of the hemicellulose and the lignin that are harmful to the zymolysis production of the ethanol, uses the substances for other purposes, and only utilizes the cellulose as the substrate so as to implement the ethanol zymolysis, thus realizing complete utilization of the raw material of native cellulose. Simultaneously the method can avoid adsorption of the hemicellulose and the lignin by cellulose enzyme and improve the activity of the cellulose enzyme; the accumulation of the substances that are not fermented in a reactor is reduced, and the method can realize continuous zymolysis in a long time, has high input concentration, recycles yeast and cellulose enzyme, has high concentration of recycled ethanol, and saves water.

Description

(1) Technical field [0001] The invention belongs to the technical field of ethanol fermentation industry, and particularly relates to a method for preparing ethanol by one-step fermentation using natural cellulose raw materials through ionic liquid classification treatment. (2) Background technology [0002] Ethanol is the main representative of biomass liquid energy materials and the most likely substitute for fossil fuels. With the progress of society, environmental pollution and energy shortages have increasingly plagued the survival and development of human beings. As a clean and renewable energy source, ethanol has increasingly important practical significance. The production of ethanol by microbial fermentation using starch and sugar compounds as raw materials is a mature technology, but the cost of raw materials is high and the food consumption is not abundant, so it is difficult to meet the large-scale development and utilization in today's society. [0003] Cellulo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P7/10C12R1/865
CPCY02E50/16Y02E50/10
Inventor 刘振王键吉尹卫平杨敏
Owner HENAN UNIV OF SCI & TECH
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