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Method for extracting hemicellulose from biomass by using eutectic solvent

A deep eutectic solvent and hemicellulose technology, applied in the field of biomass refining, can solve the problems of low yield of hemicellulose, harm to human health, toxicity of solvents, etc., and achieve simple preparation, low price, and mild treatment conditions Effect

Active Publication Date: 2020-10-23
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of using the organic solvent method is that the yield of hemicellulose is low, and most of the solvents are toxic, which will endanger human health and cause environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for extracting hemicellulose from biomass with a deep eutectic solvent, the specific steps are as follows:

[0034] (1) Pulverize the air-dried poplar raw material, sieve out 40-60 mesh wood powder, and then extract the toluene-ethanol mixture with a volume ratio of 2:1 for 6 hours to obtain a degreasing raw material.

[0035] (2) choline chloride and ethanolamine were mixed in a molar ratio of 1:6, placed in a sealed container, heated and stirred at 60° C. for 2 hours to prepare a uniform and transparent choline chloride-ethanolamine deep eutectic solvent.

[0036] (3) Mixing the defatted wood flour in step 1) and the deep eutectic solvent prepared in step 2) at a solid-to-liquid weight ratio of 1:20, heating and stirring at 60° C. for 6 hours to obtain a mixed slurry.

[0037] (4) the treated slurry is diluted with water, filtered, the gained filtrate is concentrated by rotary evaporation, then added dropwise to the ethanol of 3 times the volume, left to stan...

Embodiment 2

[0040] The separation method of hemicellulose in biomass is the same as that in Example 1, except that the heat treatment temperature in step (3) is changed from 60°C to 80°C. After testing, the extraction rate of hemicellulose was 64.2%.

Embodiment 3

[0042]The separation method of hemicellulose in biomass is the same as that in Example 1, except that the heat treatment temperature in step (3) is changed from 60°C to 100°C. After testing, the extraction rate of hemicellulose was 57.3%.

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PUM

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Abstract

The invention discloses a method for efficiently separating hemicellulose from a biomass raw material by using a deep eutectic solvent one-step method. The separation method comprises the following steps: (1) mixing a hydrogen bond receptor and a hydrogen bond donor to form a deep eutectic solvent system; (2) mixing the biomass raw material and the eutectic solvent, putting the mixture into a reaction kettle, and reacting to obtain reaction slurry; and (3) after the reaction is finished, cooling, adding water, stirring and diluting, filtering, carrying out solid-liquid separation, slowly dropwise adding into ethanol, precipitating, filtering, washing and drying to obtain the hemicellulose. According to the method, the eutectic solvent is easy to prepare, low in price and stable in property, and has good solubility to hemicellulose; an intermediate process of preparing holocellulose by delignification is not needed; the yield of hemicellulose is high; the treatment conditions are mild,and the solvent can be recycled so that the energy consumption and the cost are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of biomass refining, and in particular relates to a method for extracting and separating hemicellulose from biomass raw materials by utilizing a low eutectic solvent. Background technique [0002] Hemicellulose is a type of sugar composed of different types of five-carbon sugars (β-D-xylose, α-L-arabinose), six-carbon sugars (β-D-glucose, β-D-mannose, α-D- Galactose, α-L-rhamnose and α-L-fucose) and uronic acids (α-D-glucuronic acid, α-D-4-O-methyl-glucuronic acid and α-D -Galacturonic acid) is composed of heterogeneous glycans, which together with cellulose and lignin constitute plant cell walls. At present, the utilization rate of hemicellulose is low. For example, in the traditional pulping and papermaking process, hemicellulose, which accounts for more than 20% of the biomass raw material mass, is concentrated and burned, but the combustion value of hemicellulose is low, only 13.6MJ / kg, resulting in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14
CPCC08B37/006C08B37/0003
Inventor 边静杨积有汪洋张婉靖李明飞彭锋
Owner BEIJING FORESTRY UNIVERSITY