A kind of method for preparing o-methoxyphenol from lignin

A technology of o-methoxyphenol and lignin, applied in ether preparation, organic chemistry, etc., can solve the problems of poor selectivity of lignin degradation and liquefaction, difficulty in practical utilization, and complex lignin structure, so as to avoid repolymerization and side effects Reaction, low cost, and the effect of improving conversion efficiency

Active Publication Date: 2019-10-18
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The conversion of lignin has not received the same attention as cellulose and hemicellulose. The main reasons are: on the one hand, lignin has a complex structure, is highly cross-linked, and is difficult to convert. Under general cracking conditions, up to 40% of it will form cracking gas and coke , the residual amount is large, the conversion efficiency is low, and it has no economic benefits; on the other hand, the selectivity of lignin degradation and liquefaction is poor, resulting in complex product composition, which is difficult to realize practical utilization

Method used

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  • A kind of method for preparing o-methoxyphenol from lignin

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Experimental program
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Effect test

Embodiment 1

[0022] Take lignin, and at room temperature, presoak and activate it with ethanol and water equal in quality to lignin, respectively, and the presoaking time is 30 minutes.

[0023] Put the preactivated lignin in a high-pressure reactor, use ethanol and water as the medium, the volume ratio of ethanol and water is 1:1, and then add the solid acid MCM-41 acidified by sulfuric acid as a catalyst, at 240 ° C After reacting for 0.5 hours, cool to room temperature, filter the reaction solution, extract the filtrate with ethyl acetate, wash the filter residue with a small amount of ethyl acetate, combine the extract and washing solution, concentrate in vacuo to obtain pure o-methoxyphenol, and recover acetic acid Ethyl ester was continued in the extraction step described above.

Embodiment 2

[0025] The lignin is taken, and it is activated by presoaking with ethanol and water respectively, and the consumption of ethanol and water are respectively 1.2 times of the lignin.

[0026] Put the preactivated lignin in a high-pressure reactor, use ethanol and water as the medium, the volume ratio of ethanol and water is 1:1, and then add the solid acid MCM-41 acidified by sulfuric acid as a catalyst, at 230 ° C After reacting for 0.5 hours, cool to room temperature, filter the reaction solution, extract the filtrate with ethyl acetate, wash the filter residue with a small amount of ethyl acetate, combine the extract and washing solution, concentrate in vacuo to obtain pure o-methoxyphenol, and recover acetic acid Ethyl ester was continued in the extraction step described above.

Embodiment 3

[0028] Take lignin, and presoak and activate it with ethanol and water respectively, and the amount of ethanol and water is respectively 3 times that of lignin.

[0029] Put the preactivated lignin in a high-pressure reactor, use ethanol and water as the medium, the volume ratio of ethanol and water is 1:1, and then add the solid acid MCM-41 acidified by sulfuric acid as a catalyst, at 200 ° C After reacting for 0.5 hours, cool to room temperature, filter the reaction solution, extract the filtrate with ethyl acetate, wash the filter residue with a small amount of ethyl acetate, combine the extract and washing solution, concentrate in vacuo to obtain pure o-methoxyphenol, and recover acetic acid Ethyl ester was continued in the extraction step described above.

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Abstract

The invention discloses a method for preparing o-methoxyphenol from lignin. The method includes: lignin pre-activation: pre-soaking and activating lignin with ethanol and water in sequence; placing the pre-activated lignin in a high-pressure reactor, using ethanol and water as a medium, and then adding a solid acid as a catalyst, React at 200-240°C for 0.5-1 hour to obtain a reaction liquid, filter it, extract the filtrate, and concentrate the extract to obtain o-methoxyphenol. The present invention uses lignin by-products derived from agricultural and forestry wastes as raw materials to obtain o-methoxyphenol by specific process extraction, and the obtained o-methoxyphenol is pure o-methoxyphenol without any other impurities, and its application A good foundation is laid, and the preparation process is simple, the cost is low, and the method has great application prospects.

Description

technical field [0001] The invention specifically relates to a method for preparing o-methoxyphenol from lignin. Background technique [0002] Lignin is a natural organic polymer with a content second only to cellulose in nature. It uses three phenylpropanes (sinaphyl alcohol, coniferyl alcohol and coumaryl alcohol) as structural units, and forms an amorphous network macromolecule through C-C and C-O-C alkali connections. It is the only renewable raw material of aromatic substances in nature; lignin wraps cellulose through intermolecular hydrogen bonding, and combines with hemicellulose covering cellulose through hydrogen bonding and covalent bonding to form a plant skeleton structure; lignin It contains great potential for the production of bulk chemicals and fine chemicals, but the complex structure of lignin makes it difficult to efficiently and selectively convert it to be effectively utilized. [0003] At present, the available lignin mainly comes from the black liquor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C41/01C07C43/23
Inventor 姜曼谢伟周祚万王奇徐晓玲孟繁彬王泽永
Owner SOUTHWEST JIAOTONG UNIV
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