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A kind of method for preparing phenolic compound

A technology for phenolic compounds and catalysts, which is applied in the field of preparing phenolic compounds, can solve problems such as difficulty and reduce selectivity of phenolic compounds, and achieve the effects of simple preparation, high efficiency and wide sources.

Active Publication Date: 2019-02-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the preparation of phenolic compounds by the lignin route reduces the dependence on petrochemical phenols, there are still some difficulties
Lignin depolymerization is usually achieved by hydrogenation route, which easily causes excessive hydrogenation of benzene ring and reduces the selectivity of phenolic compounds

Method used

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  • A kind of method for preparing phenolic compound

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 200g of ammonium cerium nitrate and bake it at 500°C for 5h under air atmosphere to obtain cerium dioxide. Fill the 14-25 mesh catalyst with cerium oxide forming sieve into a reaction tube with an inner diameter of 7mm, fill it with a 15cm bed, and under normal pressure, prepare the reaction solution of acetic acid, formaldehyde and ethanol according to the molar ratio of 1:5:1. Raw materials, the feed rate is 0.03mL·min -1 , nitrogen as the carrier gas, the flow rate is 30mL·min -1 , reacted at 350°C for 12h, and separated the liquid after the reaction, and the oil phase and water phase obtained were analyzed by chromatography respectively. The conversion of acetic acid was 70% and the overall selectivity to phenolic compounds was 75%.

Embodiment 2

[0029] Weigh 200g of ammonium cerium nitrate and bake it at 500°C for 5h under air atmosphere to obtain cerium dioxide. Fill the 14-25 mesh catalyst of ceria forming sieve into a reaction tube with an inner diameter of 8 mm, fill it with a 25 cm bed, and under normal pressure, use the reaction solution prepared by acetic acid and formaldehyde according to the molar ratio of 1:5 as the raw material, and feed The speed is 0.03mL·min -1 , nitrogen as the carrier gas, the flow rate is 30mL·min -1 , reacted at 350°C for 12h, and separated the liquid after the reaction, and the oil phase and water phase obtained were analyzed by chromatography respectively. The conversion of acetic acid was 80%, and the overall selectivity to phenolic compounds was 73%.

Embodiment 3

[0031] Weigh 50g of cerium nitrate and dissolve it in 4L of water, use 25wt% ammonia water as a precipitating agent, adjust the pH of the system to 9, centrifuge the obtained precipitate, dry it, and roast it at 500°C for 3 hours to obtain cerium oxide. Fill the 14-25 mesh catalyst with cerium oxide forming sieve into a reaction tube with an inner diameter of 7 mm, fill it with a 9 cm bed, and under normal pressure, prepare the reaction solution of acetic acid, formaldehyde and methanol according to the molar ratio of 1:5:1. Raw materials, the feed rate is 0.03mL·min -1 , nitrogen as the carrier gas, the flow rate is 30mL·min -1 , reacted at 350°C for 12h, and separated the liquid after the reaction, and the oil phase and water phase obtained were analyzed by chromatography respectively. The conversion of acetic acid was 100%, and the overall selectivity to phenolic compounds was 85%.

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Abstract

The present invention relates to a method for preparing phenolic compounds. The method uses acetic acid, formaldehyde, or acetic acid, formaldehyde and methanol as reactants, and in ceria (CeO 2 ) under the catalysis of the preparation of phenolic compounds. The reaction is carried out under normal pressure in a fixed-bed reactor, and the reaction temperature is 300°C to 550°C. The reaction conversion rate of the method of the present invention is high, the highest conversion rate of the reaction reaches 100%, and the total selectivity of phenolic compounds reaches 85%. ; In addition, the present invention selects CeO 2 As a catalyst, the catalyst is cheap, easy to prepare and high in efficiency, and can be regenerated after being calcined to remove carbon deposits, so it has potential application prospects.

Description

technical field [0001] The invention relates to a method for preparing phenolic compounds, in particular to a method for catalytically preparing phenolic compounds by using acetic acid, formaldehyde and / or methanol as reactants. Background technique [0002] Phenolic compounds are an important class of organic chemical raw materials. Phenol is one of the important derivatives of propylene, mainly used in the production of phenolic resin, caprolactam, bisphenol A, adipic acid, aniline, alkylphenol, salicylic acid, etc.; methylphenol is mainly used in phenolic resin, electrical insulating paint, Dyes, surfactants and lubricant additives, etc. In addition, phenolic compounds play a major role in the life activities of the human body and plants, such as anti-oxidation and anti-virus. [0003] At present, the main sources of phenolic compounds are petrochemical crude oil and plants. Crude oil is distilled at atmospheric pressure to obtain light oil, which is hydrogenated, then...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C37/07C07C39/07
CPCY02P20/52
Inventor 王峰王业红徐杰张健张志鑫张晓辰
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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