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Method for preparing aromatic monomer products through degradation of lignin

A technology for degradation products and products, applied in the field of degrading lignin, can solve the problems of insufficient reaction between lignin and oxygen, pollute the environment, etc., and achieve the effects of convenient operation, high concentration and high thermal stability

Inactive Publication Date: 2015-09-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used chemical method mainly adopts the oxidative degradation of lye, but the oxidative degradation of lignin and oxygen in the traditional alkaline medium has the disadvantages of insufficient reaction and environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing aromatic monomer products by degradation of lignin, the improved implementation steps are as follows:

[0022] (1) Weigh 5wt% (isotropic ionic liquid) eucalyptus lignin and ionic liquid (1-ethyl-3-methyl-imidazolium chloride salt) into a stainless steel autoclave, heat to a reaction temperature of 90°C, Use a booster pump to pump oxygen to a certain oxygen pressure of 1MPa. After reacting for a certain period of time for 1 h, the water bath in the reactor was lowered to room temperature. Unreacted lignin was precipitated by centrifugation, and the supernatant was collected for future use.

[0023] (2) The collected supernatant containing ionic liquids and lignin degradation products was extracted three times with ethyl acetate, the extracts were combined, and the aromatic monomer products were obtained by rotary evaporation.

[0024] (3) Dissolve the degradation product in an aqueous solution containing 5% (v / v) acetonitrile and 5% (v / v) acetic ...

Embodiment 2

[0027] As shown in Example 1, the difference is that the NaOH solution of 2mol / L is used as the reaction medium, and the resulting aromatic monomer products mainly contain vanillic acid, vanillin, syringic acid, syringaldehyde and acetosyringone. The concentration is 5.8mg / g.

Embodiment 3

[0029] As shown in Example 1, the difference is that the oxidative degradation reaction temperature of lignin is 110°C, and the obtained aromatic monomer products mainly include vanillic acid, vanillin, syringic acid, syringaldehyde and acetosyringone. It is 16.0 mg / g.

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Abstract

The invention discloses a method for preparing aromatic monomer products through degradation of lignin; the method takes sulfate pulp lignin as a raw material, an ionic liquid as a reaction medium and oxygen as an oxidant, and adopts the following product processes: dissolving the lignin in the ionic liquid, carrying out oxygen oxidation degrading, extracting with an organic solvent, and concentrating to obtain the aromatic monomer products. The oxidation products are aromatic compound monomers mainly containing aromatic aldehydes, acids and ketones. Compared with a traditional water medium oxidation system strong alkali, the aromatic method not only overcomes pollution problems to the environment, but also has the product concentration significantly higher than that of a traditional strong alkali oxidation system. The yield of the monomer aromatic products adopting the reaction system is more than 3 times that of traditional strong alkali oxidation products.

Description

technical field [0001] The invention relates to the technical field of utilization and treatment of agricultural and forestry biomass resources, in particular to a method for degrading lignin. Background technique [0002] The structure of lignin is composed of methoxylated phenol rings linked by ether bonds. There are three main chemical structural units of lignin, which vary with different plant species. Gymnosperm (coniferous wood) is mainly guaiacylpropane Structure, angiosperms (broad-leaved wood) mainly have guaiac-based and syringyl-based structures, and monocots (grasses) have a considerable number of p-hydroxyphenyl-based structures in addition to the above two structures. Based on the structural characteristics of lignin, the preparation of small molecular aromatic aldehydes (vanillin, syringaldehyde, etc.) by lignin degradation is one of the feasible ways to make high-quality utilization of lignin. [0003] The research on the degradation of lignin is to degrade ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C65/21C07C51/21C07C47/58C07C47/575C07C49/84C07C45/51
CPCC07C51/21C07C45/51C07C65/21C07C47/58C07C47/575C07C49/84
Inventor 付时雨田景阳
Owner SOUTH CHINA UNIV OF TECH
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