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Method for improving fractional separation and depolymerization of lignin of biomass and application of method

A technology for fractional separation and lignin, applied in the directions of lignin derivatives, chemical instruments and methods, ether preparation, etc., can solve problems such as commercial development limitations, ineffective implementation, etc., to achieve the effect of increasing applicability

Pending Publication Date: 2021-03-30
绿惜再生计划有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Although increasing environmental pressures are driving a shift from petrochemical refining production to biorefining production, the production of biofuels and useful products from biomass in an economical and sustainable manner involves many challenges
The biorefining process remains largely conceptual with limited real-life commercial development
Biorefining processes are known to require optimized pretreatment conditions for different biomass species, which means that a single treatment system cannot effectively perform a range of biomass materials (e.g., hardwood, softwood, straw, wheat straw, bagasse) or mixed biomass (e.g. , a mixture of different wood species, a mixture of softwood and hardwood) biorefining process

Method used

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  • Method for improving fractional separation and depolymerization of lignin of biomass and application of method
  • Method for improving fractional separation and depolymerization of lignin of biomass and application of method
  • Method for improving fractional separation and depolymerization of lignin of biomass and application of method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0063] 1. Pretreatment of eucalyptus wood powder: eucalyptus wood chips are made into eucalyptus wood powder, eucalyptus wood powder is added in the pretreatment liquid (mixed solution of glycol and water), with sulfuric acid as catalyst, adopt rotary cooker (Xianyang Tongda Light Industry Equipment Co., Ltd.) pretreated the eucalyptus powder. Wherein, the dihydric alcohol is ethylene glycol (EG), 1,2-propanediol (1,2-PG), 1,3-propanediol (1,3-PG), 1,3-butanediol (1 ,3-BDO), 1,4-butanediol (1,4-BDO).

[0064]Mix 50g of eucalyptus powder with 20mmol / L sulfuric acid and pretreatment solution (volume ratio of glycol and water is 65%:35%), and mix with liquid (sulfuric acid and glycol) solid mass ratio as 7:1. The digester was heated to 167-173° C. for pretreatment at a rate of 3° C. / min, and kept at this temperature for 60 minutes. The specific experimental conditions of Examples 1-5 are shown in Table 1.

[0065] Glycol and solvent ratio in acid concentration, pretreatment sol...

Embodiment 6-10

[0070] 1. Pretreatment of eucalyptus wood powder: join eucalyptus wood powder in the pretreatment solution (mixed solution of glycol and water), use sulfuric acid as catalyst, adopt rotary cooker (Xianyang Tongda Light Industry Equipment Co., Ltd.) to treat eucalyptus Wood flour is pretreated. Wherein, the dihydric alcohol is ethylene glycol (EG), 1,2-propanediol (1,2-PG), 1,3-propanediol (1,3-PG), 1,3-butanediol (1 ,3-BDO), 1,4-butanediol (1,4-BDO).

[0071] Mix 50g of eucalyptus powder with 25mmol / L of sulfuric acid and pretreatment solution (the volume ratio of glycol and water is 85%:15%), and mix it with liquid (sulfuric acid and glycol) at a solid mass ratio of 7:1. The digester was heated to 167-173° C. for pretreatment at a rate of 3° C. / min, and kept at this temperature for 60 minutes. The specific experimental conditions of Examples 6-10 are shown in Table 2.

[0072] Concentration of acid, dibasic alcohol and its solvent ratio in the pretreatment solution in table...

Embodiment 11

[0077] The difference from Example 10 is that the acid concentration is 150mmol / L, the pretreatment temperature is 120°C, and the pretreatment time is 240min.

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Abstract

The invention belongs to the technical field of biomass application, and discloses a method for improving lignin fractional separation and depolymerization of biomass and an application thereof. The method comprises the following steps: cooking treated biomass with a pretreatment solution at 120-173 DEG C, and taking acid as a catalyst, wherein the pretreatment solution comprises an organic solvent and water; wherein the organic solvent is C2-C5 and an organic solvent containing more than two hydroxyl groups, and obtaining biomass containing cellulose and lignin and a pretreatment solution containing lignin; separating and washing the pretreatment solution, combining the pretreatment solution containing lignin, mixing the combined pretreatment solution with water, and carrying out precipitation, filtration and drying treatment to obtain lignin; mixing lignin, an organic solvent and a depolymerization catalyst, and carrying out catalytic depolymerization reaction at 180-250 DEG C in a protective atmosphere to obtain the lignin monomer. According to the method, the depolymerizability of the lignin and the yield of the monophenol compound are improved, and the lignin monomer has morebeta-O-4 bonds and less condensed phenolic groups.

Description

technical field [0001] The invention belongs to the technical field of biomass application, and more specifically relates to a method for improving fractionation and depolymerization of biomass lignin and its application. Background technique [0002] Lignocellulosic biomass serves as a valuable resource for the production of biofuels and functional chemicals. The cellulose biomass mainly includes cellulose, hemicellulose and lignin, each of which has great differences among different plant species and is distributed in different positions of the plant. Among them, cellulose is a linear polymer of glucose interconnected by 1,4-glycosidic bonds, which is arranged into ordered fibers with crystalline and amorphous regions. Hemicellulose is the matrix in plant cell walls, a branched polymer composed mainly of pentose sugars such as xylose and arabinose and hexose sugars such as glucose, mannose and galactose. Lignin is a three-dimensional aromatic biopolymer. Lignocellulose h...

Claims

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Application Information

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IPC IPC(8): C07C41/01C07C43/23C07G1/00C08H7/00
CPCC07C41/01C07G1/00C08H6/00C07C43/23
Inventor 董澄宇吕绍元杨智淳谢灏贤默罕默德·凯鲁·伊斯拉姆
Owner 绿惜再生计划有限公司
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