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Method for separating and extracting lignin-carbohydrate complex from wood fiber prehydrolysis solution

A carbohydrate and pre-hydrolyzate technology, applied in the field of lignocellulose extraction, can solve the problems of high energy consumption, complex process, low product purity, etc., and achieve the effects of high yield and purity, high solvent selectivity, and simple extraction process

Active Publication Date: 2019-07-26
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This LCC separation and extraction method has high energy consumption, complicated process, and low product purity (60-85%)
The existing LCC separation and extraction processes all have the defects of high energy consumption and complicated process. Obtaining a large amount of high-purity LCC with low energy consumption and high efficiency has become a breakthrough to realize its industrial application.
[0006] The process of extracting amphiphilic LCC by the above two methods all faces the problem of multiple solvents and step-by-step extraction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The method for separating and extracting lignin-carbohydrate complex (LCC) from spruce prehydrolyzate, its steps are as follows:

[0025] (1) Get 50ml spruce prehydrolyzate, filter and separate prehydrolyzate with filter paper, remove water-insoluble impurities, obtain filtrate

[0026] (2) add mixed solvent to filtrate by volume ratio 1:6, extract 24 hours, obtain mixed solution; Wherein, mixed solvent is formed by mixing chloroform and acetone; The volume ratio of acetone and chloroform is 1:1;

[0027] (3) The mixed solution is left to stand and the supernatant is decanted to obtain a solid, and the solid is filtered and washed with a mixed solvent until the filtrate becomes colorless;

[0028] (4) Freeze-dry the solid obtained in step 3) for 24 hours to obtain the lignin-carbohydrate complex LCC;

[0029] Table 1 Relevant indicators of extracting LCC from spruce prehydrolyzate

[0030] Yield (%) purity(%) Lignin content (%) Carbohydrate content (%) ...

Embodiment 2

[0032] The method for separating and extracting lignin-carbohydrate complex (LCC) from poplar prehydrolyzate, its steps are as follows:

[0033] (1) Get 50ml poplar wood pre-hydrolyzate, filter and separate pre-hydrolyzate with filter paper, remove water-insoluble impurities, obtain filtrate;

[0034] (2) add mixed solvent in filtrate by volume ratio 1:6, extract 24 hours, obtain mixed solution; Wherein, mixed solvent is mixed by chloroform and acetone; The volume ratio of acetone and chloroform is 1:2;

[0035] (3) The mixed solution is left to stand and the supernatant is decanted to obtain a solid, and the solid is filtered and washed with a mixed solvent until the filtrate becomes colorless;

[0036] (4) Freeze-dry the solid obtained in step 3) for 24 to 72 hours to obtain the lignin-carbohydrate complex LCC;

[0037] Table 2 Relevant indicators of extracting LCC from poplar prehydrolyzate

[0038] Yield (%) purity(%) Lignin content (%) Carbohydrate conten...

Embodiment 3

[0040] The method for separating and extracting lignin-carbohydrate complex (LCC) from wheat straw prehydrolyzate, its steps are as follows:

[0041] (1) Get 50ml of wheat straw pre-hydrolyzate, filter and separate the pre-hydrolyzate with filter paper, remove water-insoluble impurities, and obtain filtrate;

[0042] (2) Add a mixed solvent to the filtrate at a volume ratio of 1:6 to 8, and extract for 24 hours to obtain a mixed solution; wherein, the mixed solvent is formed by mixing chloroform and acetone; the volume ratio of acetone and chloroform is 1:2;

[0043] (3) The mixed solution is left to stand and the supernatant is decanted to obtain a solid, and the solid is filtered and washed with a mixed solvent until the filtrate becomes colorless;

[0044] (4) Freeze-dry the solid obtained in step 3) for 24 hours to obtain the lignin-carbohydrate complex LCC;

[0045] Table 3 Relevant indicators of extracting LCC from wheat straw prehydrolyzate

[0046] Yield (%)...

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Abstract

The invention discloses a method for separating and extracting lignin-carbohydrate complex (LCC) from wood fiber prehydrolysis solution. The method includes the steps: filtering the wood fiber prehydrolysis solution to remove water insoluble impurities to obtain filter liquor; adding mixed solvents into the filter liquor to extract mixed solution, performing standing on the mixed solution, decanting liquid supernatant to obtain solid, and filtering and washing the solid by mixed solvents until filter liquor is colorless; freeze-drying the solid to obtain the LCC. According to the method, the LCC is separated and extracted from wood fiber prehydrolysis 'waste' solution, the prehydrolysis solution is waste in the preparation process of dissolving pulp, the LCC is directly separated and extracted, energy consumption is reduced, resource utilization rate is increased, and environmental pollution caused by 'waste' solution is relieved.

Description

technical field [0001] The invention relates to the field of lignocellulosic extraction, in particular to a method for separating and extracting lignin-carbohydrate complex (LCC) from lignocellulosic prehydrolyzed liquid. Background technique [0002] Lignin-carbohydrate complex (Lignin-Carbohydrate Complex, LCC) is a natural polymer composed of lignin and carbohydrates through chemical covalent bonds. LCC contains not only a hydrophobic lignin rigid block, but also a hydrophilic polysaccharide soft block, which is amphiphilic. Both polysaccharides and lignin in LCC can be biodegraded and absorbed, and participate in the metabolic cycle as an important carbon source, non-toxic and biodegradable. Lignin and polysaccharides in LCC are not simply physically stacked together, but a complex formed by benzyl ether bonds, benzyl ester bonds, acetal bonds and phenyl glycosidic bonds, which is an amorphous polymer Polymer with physical, chemical and biological stability. At the sa...

Claims

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Application Information

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IPC IPC(8): C08H8/00
CPCC08H8/00
Inventor 冯年捷赵思刘玉浩
Owner HUBEI UNIV OF TECH
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