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Method for preparing 3,5-dimethylphenol

A technology of dimethylphenol and trimethyl, which is applied in 3 fields, can solve the problems of large catalyst usage, low yield and selectivity, etc., and achieve the advantages of reduced catalyst usage, improved yield and selectivity, and mild reaction conditions Effect

Inactive Publication Date: 2009-01-21
HUNAN LIJIE BIOCHEM
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome a kind of improved use of 3,5,5-trimethyl 2-cyclohexene-1 in order to overcome the disadvantages such as large amount of catalyst usage, low yield and selectivity in the existing production method -Method for synthesizing 3,5-dimethylphenol from ketone

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 3

[0015] The preparation of embodiment 3,5-dimethylphenol

[0016] The reactor used in the experiment is a pressurized gas-solid phase reaction experimental device produced by Tianda Beiyang Chemical Industry. The reactor specification is a stainless steel tubular reactor of Ф38×5×720. The detection instrument used in the experiment is GC-2010 provided by Shandong Tengzhou Jinpu Instrument Co., Ltd., the column is OV1701, and the length is 50 meters. Detection conditions The column temperature is 200°C, the detection chamber is 240°C, and the vaporization chamber is 240°C.

[0017] A certain amount of catalyst and isophorone are mixed, injected into the gasification chamber through a metering pump for gasification, and then reacted in a reaction bed, and the reactant is recovered after cooling, and then sampled for analysis. The temperature and pressure during the reaction are adjusted as necessary. The reaction results are shown in the table below:

[0018] Experim...

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PUM

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Abstract

The invention provides a preparation method of 3, 5-dimethyl phenol. The method comprises the following steps that halogenated hydrocarbon catalysts such as methyl iodide or n-bromobutane are premixed with 3, 5, 5-trimethyl 2-cyclohexene-1-ketone and then are fed into a tubular reactor so as to carry out reaction under the conditions of 400 to 600 DEG C and 1 to 5atm; then, a target product can be obtained after separation. The method can reduce the consumption of catalysts, and can substantially increase conversion rate and selectivity; moreover, reaction conditions are more moderate and more suitable for industrial production.

Description

technical field [0001] The invention relates to an industrialized preparation method of 3,5-dimethylphenol. Background technique [0002] 3,5-Dimethylphenol, also known as 5-hydroxy m-xylene, the English trade name is 3,5-xylenol, also known as 3,5-dimethylphenol, referred to as MX, is an important fine chemical raw material and organic synthesis intermediate body. Its properties are white needle-like crystals with aromatic odor, melting point 64°C, boiling point 219.5°C, sublimable, relative density 0.9680g / cm 3 , Insoluble in dry water, easily soluble in alcohol, ether, chloroform, benzene and other organic solvents and caustic alkali solution. The bactericide 4-chloro-3,5-dimethylphenol can be synthesized by the reaction of MX and sulfuryl chloride; the high-grade dye intermediate 3,5-dimethylphenol can be synthesized by the reaction of MX with hydrogen and ammonia under the condition of palladium carbon catalyst Aniline; MX and methanol can be alkylated in the presenc...

Claims

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Application Information

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IPC IPC(8): C07C39/06C07C37/07
Inventor 胡汉忠吴飞王国杰
Owner HUNAN LIJIE BIOCHEM
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