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Liquefaction method of lignin for preparing thermoplastic phenolic resin

A technology of phenolic resin and lignin, applied in the field of new acid catalyst for lignin liquefaction modification, can solve problems such as serious equipment corrosion, environmental pollution, poor catalytic effect, etc., and achieve high production efficiency, cost reduction, and reaction speed. quick effect

Inactive Publication Date: 2014-02-05
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Cheng Xiansu, Zheng Zhifeng, etc. used strong acids such as concentrated sulfuric acid and hydrochloric acid as catalysts, and phenol as a liquefying agent to liquefy lignin, which not only polluted the environment, but also severely corroded equipment. The catalytic effect of using organic weak acids such as oxalic acid as catalysts was not good.

Method used

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  • Liquefaction method of lignin for preparing thermoplastic phenolic resin
  • Liquefaction method of lignin for preparing thermoplastic phenolic resin

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Embodiment 1

[0023] A lignin liquefaction method for preparing thermoplastic phenolic resin, the liquefaction method is as follows: phenol, heteropolyacid catalyst and enzymatic lignin are mixed, heated to 90°C-160°C, and reacted for 1-3h. Among them, the mass ratio of acid catalyst to phenol is 0.5-4:100, the mass ratio of lignin to phenol is 10-60:100, the liquefaction residue rate is 0.5-20%, and the yield of phenolic compounds is 40-70%. , the molecular weight of the liquefied residue is 1100-2300, and the dispersion coefficient (Mw / Mn) is reduced by 50-90%. The lignin that participates in this reaction is enzymatic lignin, which can be extracted from the residue of plant raw material biorefinery (biofuel ethanol or butanol) containing cellulose and hemicellulose.

Embodiment 2

[0025] Add a certain amount of phenol, enzymatic lignin (accounting for 33% of the mass of phenol) and phosphotungstic acid (accounting for 0.5% of the mass of phenol) into the reactor, the reaction temperature is 95 ° C, and the reaction time is 2 hours to obtain enzymatic lignin The liquefied product has a residue rate of 11.5%, a yield of phenolic compounds of 47%, and a liquefied residue molecular weight of 1910.

Embodiment 3

[0027] Add a certain amount of phenol, enzymatic lignin (33% of phenol mass) and phosphotungstic acid (1% of phenol mass) into the reactor, the reaction temperature is 115°C, and the reaction time is 1.5h to obtain enzymatic lignin liquefaction The product has a residue rate of 9.7%, a yield of phenolic compounds of 56%, and a liquefaction residue molecular weight of 1790.

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Abstract

The invention discloses a liquefaction method of lignin for preparing a thermoplastic phenolic resin. The liquefaction method is as follows: mixing phenol, a heteropoly acid catalyst and enzymatic hydrolysis lignin, heating to 90-160 DEG C, and liquefying for 1-3 h to obtain a liquefied product. The invention provides an efficient method for preparing a phenolic compound used for substituting phenol by using enzymolysis lignin in abundant resource, and the method uses the a green heteropoly acid catalyst, which has no pollution to the environment. The enzymolysis lignin liquefaction product obtained by the invention can be used in the preparation of a lignin base thermoplastic phenolic resin.

Description

technical field [0001] The invention relates to a lignin liquefaction method for preparing thermoplastic phenolic resin, in particular to a method for the liquefaction modification of lignin with a novel acid catalyst. Background technique [0002] Lignin is the only non-petroleum resource that can provide renewable aryl compounds in nature, and it is the second most abundant natural polymer after cellulose in the plant kingdom. Lignin molecules have many different types of active groups, which have the advantages of being renewable, degradable, and non-toxic. Enzymatic Hydrolysis Lignin (EHL for short) is a new type of lignin extracted from the residue of fuel ethanol produced by fermentation of plant straw. At present, most of the enzymatic lignin is used for incineration, not only its components have not been effectively used, but also pollute the environment. my country now produces 600 to 700 million tons of corn stalks per year, and the residue of fuel ethanol produce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/34C08H7/00
Inventor 胡立红周静周永红杨晓慧
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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