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Method for pretreating lignocellulose by adopting alkaline eutectic solvent

A deep eutectic solvent and lignocellulose technology, which is applied in the pulping of cellulose raw materials, methods based on microorganisms, and fiber raw material processing, can solve the problems of high recovery energy consumption, environmental hazards, and non-renewable, and achieve operability Strong performance, improved recovery, and low cost

Active Publication Date: 2018-08-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ionic liquids commonly used in lignocellulose pretreatment are mainly ionic liquids based on imidazole and pyrimidine, which are expensive and easy to cause environmental hazards
This type of ionic liquid is non-renewable and sensitive to moisture, so its recovery energy consumption is high

Method used

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  • Method for pretreating lignocellulose by adopting alkaline eutectic solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Sweet sorghum stalks were treated with choline / ethanolamine deep eutectic solvent, followed by enzymatic hydrolysis and saccharification.

[0066] (1) Absolutely dry sweet sorghum stalks with a particle size of less than 60 mesh are taken, and the stalks are washed with water to completely remove free sugar before drying.

[0067] (2) Preparation of deep eutectic solvent: prepare choline / ethanolamine deep eutectic solvent with a molar ratio of 1:1. The preparation method is to heat choline and ethanolamine mixed in a molar ratio of 1:1 to 90°C , maintained at 500rpm for 30min, and cooled to become the choline / ethanolamine deep eutectic solvent.

[0068] (3) The dry sweet sorghum slag was mixed with the pre-prepared deep eutectic solvent at a solid-liquid ratio of 1:20 (w / v) to obtain a solid-liquid mixture (slurry).

[0069] (4) Maintain the solid-liquid mixture (slurry) at 100° C. for 1 h.

[0070] (5) After the reaction is completed, cool to room temperature, and th...

Embodiment 2

[0073] Choline chloride / isopropanolamine / sodium hydroxide / water solution was used to pretreat corn stover residue with microwave assistance.

[0074] (1) Prepare corn stalk residue with a particle size below 60 mesh.

[0075] (2) Preparation of deep eutectic solvent: Prepare choline chloride / isopropanolamine deep eutectic solvent with a molar ratio of 1:2. After the two substances are fully mixed, the solid-liquid mixture is heated to 90°C, at 500rpm Keep it under low temperature for 30 minutes, when the solution in a homogeneous phase state is present, continue to add 10% volume of 20% (w / v) sodium hydroxide aqueous solution to the solution, continue stirring evenly, and cool to room temperature.

[0076] (3) Mix corn stalk residue with a particle size below 60 mesh with the above-mentioned deep eutectic solvent at a solid addition of 10% (w / v) to prepare a solid-liquid mixture.

[0077] (4) The solid-liquid mixture was placed in a closed reactor, and the reactor was heated ...

Embodiment 3

[0080] Chlorobetaine / ethanolamine deep eutectic solvent treatment of corn cob and evaluation of the residue cleaning times on the efficiency of enzymatic hydrolysis.

[0081] (1) Prepare dry corn cobs with a particle size below 80 mesh.

[0082] (2) Preparation of deep eutectic solvent: prepare chlorinated betaine / ethanolamine deep eutectic solvent with the mol ratio of 2:1, its preparation method is, will be heated to choline and ethanolamine mixed with the mol ratio of 2:1 Keep at 90°C for 30 minutes at 500rpm, and cool to become the betaine chloride / ethanolamine deep eutectic solvent.

[0083](3) The absolute dry corn cob with a particle size below 80 meshes is mixed with the above-mentioned deep eutectic solvent according to the solid addition amount of 5% (w / v) to obtain a solid-liquid mixture.

[0084] (4) Put the solid-liquid mixture into an airtight container and react at 140° C. and 500 rpm for 1 h.

[0085] (5) After the reaction is finished, the solid matter is ta...

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Abstract

The invention relates to a method for pretreating lignocellulose by adopting an alkaline eutectic solvent. With the method, the enzymolysis efficiency of lignocellulose can be effectively enhanced, particularly, the recycling for the hemicellulose sugar monomer is improved, and the yield of total sugar is improved. The method has the advantages that the cost is low, the operability is strong, theenergy consumption is small, the environment protection is realized, etc.

Description

technical field [0001] The invention belongs to the technical field of biomass refining, and in particular relates to a method for pretreating lignocellulose with an alkaline deep eutectic solvent. Background technique [0002] The biorefinery route of producing bio-based fuels and chemicals from lignocellulosic raw materials can effectively replace the increasingly scarce petroleum resources and reduce greenhouse gas emissions and environmental pollution. Lignocellulose is mainly composed of cellulose, hemicellulose and lignin. Among them, in the biomass conversion process, cellulose and hemicellulose can be degraded into monosaccharides such as glucose and xylose through enzymatic hydrolysis, and then converted into various platform compounds by microorganisms. However, due to the complex structure of lignocellulose, the surface of cellulose is covered with lignin and hemicellulose, and there are hydrogen bonds in and between molecules, its highly crystalline structure is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P19/02C12P7/36C12P7/16C12P7/10D21C3/00C12R1/145
CPCC12P7/10C12P7/16C12P7/36C12P19/02C12P19/14C12P2201/00C12P2203/00D21C3/003Y02E50/10
Inventor 谭天伟蔡的秦培勇陈长京文皓张长伟
Owner BEIJING UNIV OF CHEM TECH
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