A kind of pretreatment method of lignocellulose raw material

A lignocellulose and pretreatment technology, applied in the field of biomass separation and conversion, can solve the problems of high waste water treatment cost, difficult recovery of chemical reagents, equipment corrosion, etc., and achieve the effect of high application and promotion value

Active Publication Date: 2022-07-19
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional pretreatment mostly adopts acid pretreatment or alkali pretreatment, but there are obvious deficiencies such as equipment corrosion, high cost of wastewater treatment or difficult recovery of chemical reagents.

Method used

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  • A kind of pretreatment method of lignocellulose raw material
  • A kind of pretreatment method of lignocellulose raw material
  • A kind of pretreatment method of lignocellulose raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A pretreatment method of lignocellulose raw material, comprising the following steps:

[0022] (1) heating choline chloride and p-toluenesulfonic acid to a clear and transparent liquid at 80°C, adding 10wt% and 30wt% absolute ethanol to the system respectively to obtain a new DES system, wherein The molar ratio of choline chloride and p-toluenesulfonic acid is 1:2;

[0023] (2) Mix the poplar processing residue with DES according to the mass ratio of 1:10, and react at 100 ° C for 30 min. After the pretreatment, separate the pretreatment material and the pretreatment liquid containing lignin, and use distilled water for the pretreatment material. Wash until the lotion is neutral.

[0024] Research results such as figure 1 As shown, the lignin content of the DES pretreatment material without adding ethanol did not decrease but increased, the xylan removal rate reached 95.5%, and the cellulose recovery rate was 86.3%. According to the substrate concentration of 5%, add...

Embodiment 2

[0031] A pretreatment method of lignocellulose raw material, comprising the following steps:

[0032] (1) heating choline chloride and p-toluenesulfonic acid to a clear and transparent liquid under the condition of 80 ° C, adding 15wt% absolute ethanol and water respectively to obtain a DES system, wherein choline chloride and p-methyl The molar ratio of benzenesulfonic acid is 1:1;

[0033] (2) Mix the Miscanthus raw material with the DES system in a mass ratio of 1:10, react at 100° C. for 30 minutes, separate the pretreatment material and the pretreatment liquid containing lignin after the pretreatment, and wash the pretreatment material with distilled water. until the lotion is neutral.

[0034] Research results such as image 3 As shown, the removal rate of lignin of the DES pretreated material with added water was negative 13.3%, the removal rate of xylan reached 93.1%, and the recovery rate of cellulose was 82.1%. According to the substrate concentration of 5%, addin...

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Abstract

The invention discloses a pretreatment method for lignocellulose raw materials, which belongs to the technical field of biomass separation and conversion. In the method, p-toluenesulfonic acid is used as the hydrogen bond donor, choline chloride is used as the hydrogen bond acceptor, and ethanol is added to synthesize a novel deep eutectic solvent, and the lignocellulose raw material is pretreated under mild conditions. The method can degrade more than 70% of lignin and 40% to 90% of hemicellulose in lignocellulosic raw materials, increase the cellulase hydrolysis yield to 100%, and at the same time separate the lignin components under low temperature conditions It can be further used for high value. This new DES system can be recycled and reused. It is a green and efficient pretreatment method with high application and promotion value.

Description

technical field [0001] The invention belongs to the technical field of biomass separation and conversion, and particularly relates to a pretreatment method for lignocellulose raw materials. Background technique [0002] The heterogeneity of the physicochemical properties of lignocellulosic cell wall components and the complexity of the cell wall structure lead to the natural anti-degradation barrier of the lignocellulosic cell wall. Appropriate pretreatment methods are used to reduce the natural anti-degradation barrier of biomass, and the subsequent lignocellulosic raw materials are affected. Enzymatic hydrolysis, transformation, utilization and fermentation are of great significance. Effective pretreatment methods aim to remove lignin and hemicellulose, reduce cellulose crystallinity, and increase material porosity. So far, a variety of pretreatment methods have been used to treat lignocellulosic raw materials, including alkali pretreatment, acid pretreatment, ionic liqui...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H8/00C08H7/00C08B37/14
CPCC08H8/00C08B37/006
Inventor 戴红旗周雪莲高欢力卞辉洋王瑞彬杨益琴
Owner NANJING FORESTRY UNIV
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