Method for efficiently separating and enzymolyzing lignocellulose with ionic liquid-high boiling alcohol composite system

A technology of lignocellulose and ionic liquid, which is applied in the fields of biomass pretreatment and chemical industry application, can solve the problems of increasing the cost of pretreatment, and achieve the effects of low production process cost, favorable regeneration, and high lignin removal rate

Active Publication Date: 2020-05-15
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a high-boiling alcohol solvent is used as a pretreatment agent for biomass, even in the presence of a catalyst, it usually requires a high temperature above 160°C to proceed. Increased the cost of pretreatment to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The corn stalks are crushed to below 20 mesh, and the non-structural components are removed to obtain the lignocellulose without the non-structural components; subsequently, the lignocellulose raw materials with the non-structural components removed are mixed with N-methyldiethanolamine methanesulfonate The complex system formed by ethylene glycol (1:1) was treated at 120°C for 2 hours; after the pretreatment, the solid and liquid were separated, and the obtained solid was subjected to component determination, and enzymatic hydrolysis to obtain sugar solution, which was analyzed by high performance liquid chromatography Determination of the glucose concentration therein shows that the removal rate of lignin is 95.21%, and the yield of cellulose by enzymatic hydrolysis is 95.17%. Adding water to the filtrate can regenerate the composite system and lignin.

Embodiment 2

[0018] The corn stalks are crushed to below 20 mesh, and the non-structural components are removed to obtain the lignocellulose without the non-structural components; subsequently, the lignocellulose raw materials with the non-structural components removed are mixed with N-methyldiethanolamine methanesulfonate The complex system (1:1) formed by high boiling alcohol propylene glycol was treated at 120°C for 2 hours; after the pretreatment, the solid and liquid were separated, and the obtained solid was subjected to component determination, and enzymatic hydrolysis to obtain sugar liquid, which was analyzed by high performance liquid phase Glucose concentration was determined by chromatography, wherein the removal rate of lignin was 94.42%, and the yield of cellulose by enzymatic hydrolysis was 96.41%. Adding water to the filtrate can regenerate the composite system and lignin.

Embodiment 3

[0020] The corn stalks are crushed to below 20 mesh, and the non-structural components are removed to obtain the lignocellulose without the non-structural components; subsequently, the lignocellulose raw materials with the non-structural components removed are mixed with N-methyldiethanolamine methanesulfonate The complex system (1:1) formed by glycerol was treated at 120°C for 2 hours; after the pretreatment, the solid and liquid were separated, and the obtained solid was subjected to component determination, and enzymatic hydrolysis to obtain sugar solution, which was analyzed by high performance liquid chromatography Determination of the glucose concentration therein shows that the removal rate of lignin is 90.65%, and the yield of cellulose by enzymatic hydrolysis is 93.59%. Adding water to the filtrate can regenerate the composite system and lignin.

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Abstract

The present invention relates to a method for efficiently separating and enzymolyzing lignocellulose with an ionic liquid-high boiling alcohol composite system. The method comprises the following basic steps: pulverizing lignocellulose to 20 mesh or smaller; after non-structural components are removed by one or more combinations of hot water, organic solvent and a neutral detergent, pre-treatmentis conducted with an ionic liquid-high boiling alcohol composite system; and after the treatment is completed, solid-liquid separation is performed to obtain cellulose-rich solids and a filtrate, thesolids are enzymatically hydrolyzed to obtain a sugar solution, and water is added to the filtrate to regenerate the composite system. Advantages are as follows: a series of advantages of low cost ofproton-type ionic liquid, high pretreatment separation efficiency, high boiling alcohol as a good solvent for lignin, etc. are fully combined, production costs are further reduced, high-efficient removing of the lignin is conducted, the efficient pretreatment and enzymolysis of the lignocellulose are further realized, and the method is strong in practicability and has good industrial application potential.

Description

technical field [0001] The invention belongs to the field of biomass pretreatment and chemical industry application, and particularly relates to a method for realizing efficient component separation and enzymolysis of lignocellulose by a composite system composed of a high-boiling alcohol solvent and a proton-type ionic liquid. Background technique [0002] As one of the most representative lignocellulosic raw materials, crop straws are huge in quantity and cheap and easy to obtain, and a large amount of crop straws are directly discarded or incinerated on site, resulting in waste of resources and pollution of the environment. Crop straw is usually composed of three main components: cellulose, hemicellulose and lignin, and its transformation and utilization have potential value. As the main component of crop straw, cellulose is a homogeneous polymer formed entirely of D-glucose connected to each other through β-1,4 glycosidic bonds. This linear structure makes it easy to fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P19/14C12P19/02
CPCC12P19/14C12P19/02C12P2201/00C12P2203/00Y02P20/54
Inventor 吕兴梅杨永青康莹徐俊丽杨绍旗张锁江
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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