Method for extracting lignin in biomass material by using ion liquid

A biomass material and ionic liquid technology, applied in the field of lignin extraction from lignocellulosic biomass, can solve the problems of easy pollution, low extraction efficiency, pollution, etc., and achieve easy processing and utilization, high purity, and reduced secondary The effect of secondary pollution

Inactive Publication Date: 2015-03-11
NANKAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of low extraction efficiency and easy pollution of lignin in lignocellulosic biomass, and to provide a method for extracting lignin in biomass materials by using ionic liquid, so as to obtain lignin with high utilization value. The ionic liquid used in this method is almost non-volatile and can be recycled many times under the conditions of use, avoiding the pollution caused by solvents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method utilizing ionic liquid to extract lignin in biomass material, comprising the following steps:

[0020] 1) After the corn stalks are naturally air-dried, they are crushed into 100-mesh powder by a pulverizer;

[0021] 2) Add the above powdered biomass into ionic liquid 1-allyl-3-methylimidazolium acetate ([Amim]Ac), the mass ratio of biomass to ionic liquid is 5:100, and the temperature is 80 ℃, stirring rate of 1000r / min under the condition of 24h, the biomass is partially dissolved in the ionic liquid to form a suspension;

[0022] 3) Cool the above suspension to 80°C and pour it into a sodium hydroxide solution with a concentration of 0.1mol / L under magnetic stirring conditions. The volume ratio of the suspension to the sodium hydroxide solution is 1:10, and the stirring reaction time is For 1h, filter to obtain the filtrate;

[0023] 4) Adjust the pH of the above filtrate to 2 with hydrochloric acid solution with a concentration of 0.2mol / L, heat and react...

Embodiment 2

[0027] A method utilizing ionic liquid to extract lignin in biomass material, comprising the following steps:

[0028] 1) After the maple sawdust is naturally air-dried, use a crusher to crush it into a 100-mesh powder;

[0029] 2) Add the above powdered biomass into ionic liquid 1-allyl-3-methylimidazolium acetate ([Amim]Ac), the mass ratio of biomass to ionic liquid is 5:100, and the temperature is 110 ℃, stirring rate of 1000r / min under the condition of 24h, the biomass is partially dissolved in the ionic liquid to form a suspension;

[0030] 3) Cool the above suspension to 80°C and pour it into a sodium hydroxide solution with a concentration of 0.1mol / L under magnetic stirring conditions. The volume ratio of the suspension to the sodium hydroxide solution is 1:10, and the stirring reaction time is For 0.5h, filter to obtain the filtrate;

[0031] 4) Adjust the pH of the above filtrate to 2 with hydrochloric acid solution with a concentration of 0.1mol / L, heat and react ...

Embodiment 3

[0035] A method utilizing ionic liquid to extract lignin in biomass material, comprising the following steps:

[0036] 1) After the bluegrass straw is naturally air-dried, it is crushed into a 100-mesh powder by a pulverizer;

[0037] 2) Add the above powdered biomass into ionic liquid 1-ethyl-3-methylimidazolium acetate ([Aeim]Ac), the mass ratio of biomass to ionic liquid is 5:100, and the temperature is 110°C . The stirring rate is 1000r / min and dissolved for 24 hours, and the biomass is partially dissolved in the ionic liquid to form a suspension;

[0038] 3) Cool the above suspension to 80°C and pour it into a sodium hydroxide solution with a concentration of 0.1mol / L under magnetic stirring conditions. The volume ratio of the suspension to the sodium hydroxide solution is 1:10, and the stirring reaction time is For 0.5h, filter to obtain the filtrate;

[0039] 4) Adjust the pH of the above filtrate to 2 with hydrochloric acid solution with a concentration of 0.1mol / L, ...

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Abstract

The invention relates to a method for extracting lignin in a biomass material by using an ion liquid. The method comprises: 1) naturally air-drying or drying a biomass solid material, and then crushing into powder; 2) adding to an ion liquid, and carrying out heating stirring dissolving to form a suspension solution; 3) adding to a sodium hydroxide solution, carrying out a stirring reaction, and filtering to obtain the filtrate; and 4) adjusting the pH value to 2 with a dilute hydrochloric acid solution, carrying out a heating reaction, filtering to obtain the filter residue and the filtrate, and drying the filter residue to obtain the lignin, wherein the filtrate is treated and then is recycled. The method of the present invention has the following advantages that: the composite structure formed by closely compounding lignin, hemicellulose and cellulose in the biomass material can be effectively destroyed, more than 30% of the lignin in the biomass material can be effectively extracted, the purity of the extracted lignin is high, and the extracted lignin is easily be subjected to the high value processing utilization; and the ion liquid can be recycled a plurality of times, the toxic or harmful byproducts are hardly produced, and the generation of the secondary pollution is reduced.

Description

technical field [0001] The invention relates to a method for extracting lignin in lignocellulosic biomass, in particular to a method for extracting lignin in biomass materials by using ionic liquid. Background technique [0002] With the rapid development of my country's industry and agriculture and the rapid changes in production and lifestyle, lignocellulosic biomass represented by straw and landscaping waste is produced in large quantities. At present, these biomass materials are dumped, landfilled or incinerated as solid waste due to difficulties in collection and low processing and utilization value, causing serious pollution problems. From another point of view, these lignocellulosic biomass materials are rich in cellulose, hemicellulose and lignin, and are one of the most abundant renewable resources on earth, of which the production of lignin is about 40 billion tons per year, is a biological macromolecule that is far from being effectively utilized. In fact, high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
Inventor 侯其东李维尊鞠美庭楚春礼邵超峰黄访
Owner NANKAI UNIV
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