Method for preparing 4-alkylphenol by self-forming hydrogenolysis of lignin or lignin oil

A technology of alkylphenol and lignin, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of difficult purification, high consumption of hydrogen or oxygen, and high production cost, and achieve low cost and dangerous The effect of small sex and increasing added value

Pending Publication Date: 2021-03-12
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

However, there are still many types of phenolic compounds converted by the above method. If traditional separation methods are used, it is difficult to purify one or several of them or to further improve their quality.
In addition, the above invention processes all need to consume a large amount of hydrogen or oxygen, and the production cost is relatively high.

Method used

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  • Method for preparing 4-alkylphenol by self-forming hydrogenolysis of lignin or lignin oil
  • Method for preparing 4-alkylphenol by self-forming hydrogenolysis of lignin or lignin oil

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Embodiment Construction

[0020] specific implementation plan

[0021] Using lignin as raw material to prepare 4-alkylphenols includes the following process: self-reforming, depolymerization and upgrading of lignin under the action of a metal catalyst supported by a nickel-aluminum composite material to obtain 4-alkylphenols mixture.

[0022] The preparation of the nickel-aluminum composite material adopts the ammonia water co-precipitation method, specifically: 40mmol nickel nitrate hexahydrate and 80mmol aluminum nitrate nonahydrate are dissolved in 200mL deionized water and stirred thoroughly, and the ammonia solution is added dropwise to pH=9, and the stirring is continued for 2h, and then Aging at room temperature for 10h. Suction filtration and washing until the pH of the washing solution is 7, and the filter cake is placed in an oven at 100ºC to dry overnight. Finally, the catalyst precursor was placed in a muffle furnace at 450 o C under roasting 4h promptly obtains the nickel-aluminum compo...

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Abstract

The invention relates to a method for preparing 4-alkylphenol from lignin or lignin oil by a one-pot method without an external hydrogen source. According to the method, lignin or lignin oil is used as a raw material, and under the action of a metal catalyst loaded by a nickel-aluminum composite material, self-reforming hydrogen production and hydrogenolysis are carried out to obtain 4-alkylphenol. With birch organic lignin and lignin oil as raw materials, the yields of 4-alkylphenol are as high as 17wt% and 25wt% respectively. The lignin is obtained by taking biomass containing a lignin component as a raw material and adopting an acidolysis or biological enzyme depolymerization method. The lignin oil is obtained by taking biomass containing lignin component as a raw material through a hydrogenolysis depolymerization method. Raw materials are wide in source and low in cost. Meanwhile, the process does not need an additional hydrogen source, and is single in product, few in by-product,easy to separate and green in solvent. Besides, the phenolic product involved in the invention is an important chemical product, is suitable for the polyester industry, and has a wide application prospect.

Description

technical field [0001] The invention provides a method for preparing 4-alkylphenol by self-reforming hydrogenolysis of lignin. Using lignin as raw material, under the action of platinum-based supported catalytic materials, depolymerization and hydrogenolysis can be achieved through self-reforming of lignin (or lignin oil) to produce hydrogen to obtain monophenols mainly composed of 4-ethylphenol product. It belongs to the research field of synthesizing chemicals by catalytic conversion of lignin. Background technique [0002] The energy shortage and environmental pollution problems facing the world today are becoming more and more serious, and it is urgent to develop and use renewable resources to replace traditional fossil energy. Biomass is a widely sourced and cheap renewable energy source, and new technologies for preparing fuels and fine chemicals using it as a raw material have attracted worldwide attention. As an important component of woody biomass, lignin is the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C37/00C07C39/06
CPCC07C37/00C07C39/06
Inventor 王艳芹李凌啸刘晓晖郭勇
Owner EAST CHINA UNIV OF SCI & TECH
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