Method for preparing protolignin by using corn cob residues

A technology for xylose residue lignin and xylose residue, which is applied in the field of separating xylose residue lignin and can solve the problems of environmental pollution, waste of lignin resources and high activity

Inactive Publication Date: 2015-01-21
ZHENJIANG BIO INNOVA BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem of waste of lignin resources in xylose residue, the lignin prepared by separation has low ash content and high activity, the average molecular weight of lignin is about 5000, the polydispersity index of lignin is about 1, and the infrared and nuclear magnetic resonance The test proved that the isolated lignin belongs to guaiacyl-syringyl lignin
The invention solves the environmental pollution and cost increase caused by the volatilization of low-boiling point solvents. The solvent used is a high-boiling point solvent, which effectively solves the problems of solvent volatilization and recycling, and eliminates waste water, waste gas, and waste residue during the extraction process. production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0005] Embodiment 2: Xylose residue is placed in the autoclave with temperature-controlling stirring paddle, adds Mg (NO 3 ) 2 ·6H 2 O is used as a catalyst, adding 1,4-butanediol and water as a solvent, and the volume ratio of 1,4-butanediol and water is 7:4; the mass ratio of xylose residue to catalyst is 100:3; the quality of xylose residue (g ) and the volume (ml) ratio of high boiling alcohol aqueous solution is 1:6; the reaction temperature is 220°C, the reaction time is 2 hours, lignin is dissolved in high boiling alcohol solvent; the cellulose is removed by filtration, and the obtained cellulose is separately utilization; then inject the filtrate into water, the volume ratio of filtrate to water is 1:2; %; The filtrate containing high-boiling alcohol is distilled under reduced pressure, and after dehydration, the high-boiling alcohol solvent can be recycled.

Embodiment 3

[0006] Embodiment 3: Place the xylose residue in a high-pressure reactor with a temperature-controlled stirring paddle, add MgCl 6H 2 O is used as a catalyst, adding ethylene glycol and water as a solvent, the volume ratio of ethylene glycol and water is 9:4; the mass ratio of xylose residue to catalyst is 100:5; the mass (g) of xylose residue and the volume of high-boiling alcohol aqueous solution (ml) The ratio is 1:8; the reaction temperature is 200°C, the reaction time is 3 hours, lignin is dissolved in a high-boiling alcohol solvent; the cellulose is removed by filtration, and the obtained cellulose is used separately; then the filtrate is injected into water , the volume ratio of filtrate to water is 1:3; lignin precipitates and is filtered, and the obtained lignin product is washed with warm water at 30°C, and lignin is obtained after drying, and the lignin extraction rate is 69%; the filtrate containing high boiling alcohol After vacuum distillation and dehydration, th...

Embodiment 4

[0007] Embodiment 4: Xylose residue is placed in the autoclave with temperature-controlling stirring paddle, adds AlCl 3 ·6H 2 O is used as a catalyst, adding propylene glycol and water as a solvent, and the volume ratio of propylene glycol and water is 10:4; the mass ratio of xylose residue to catalyst is 100:7; the mass (g) of xylose residue and the volume (ml ) ratio is 1:10; the reaction temperature is 160°C, the reaction time is 3 hours, the lignin is dissolved in a high-boiling alcohol solvent; the cellulose is removed by filtration, and the obtained cellulose is used separately; then the filtrate is injected into water, and the filtrate The volume ratio of water to water is 1:3; lignin is precipitated, filtered, and the obtained lignin product is washed with warm water at 50°C, dried to obtain lignin, and the extraction rate of lignin is 75%; the filtrate containing high boiling alcohol is reduced Pressure distillation, after dehydration, high boiling alcohol solvent c...

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PUM

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Abstract

The invention discloses a method for preparing protolignin by using corn cob residues, by which lignin in corn cob residues are effectively separated by taking high-boiling alcohol as a solvent and under the action of a catalyst. According to the invention, the biomass resources of waste gas are fully used, and lignin in corn cob residues is effectively separated. By detecting, the ash content of obtained lignin is low, the molecular weight of the lignin is about 5000, and the dispersancy index of the lignin is about 1, so that the obtained lignin is high in purity, good in activity, and narrow in molecular weight distribution, therefore, the lignin is a high-quality lignin. According to the invention, the problems of environmental pollution and cost raise caused by the volatilization of low-boiling-point solvents are solved; and because used solvents are high-boiling-point solvents and water, the problems of volatilization and cycle use of the solvents are effectively solved. The method disclosed by the invention solves the problem of corn cob residue resource waste, and the extraction rate of lignin in corn cob residues is 60-75%.

Description

technical field [0001] The invention relates to a method for separating xylose residue lignin by using high boiling alcohol. Background technique [0002] With the increasing scarcity of fossil energy, the use of renewable biomass resources to obtain various chemicals has become one of the focuses of sustainable human development today. The research in this area is currently mainly focused on the conversion of hemicellulose and cellulose, but less research on lignin. Lignin is a polyphenolic three-dimensional network polymer aromatic compound composed of phenylpropane units linked by ether bonds and carbon-carbon bonds. It can be used to prepare gasoline, diesel, methanol and aromatic compounds, and is a potential effective substitute for petroleum resources. Taste. At present, the industrial lignin separation method is mainly inorganic acid-base cooking, but the severe hydrolysis of lignin leads to high molecular weight dispersion and large chemical changes, so the use va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00
Inventor 朱道辰谢长校陈焱
Owner ZHENJIANG BIO INNOVA BIOTECH
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