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Process for preparing isopropyl benzene by catalytically hydrogenolysis alpha, alpha dimethyl benzyl alcohol

A technology of dimethyl benzyl alcohol and catalytic hydrogenolysis, which is applied in the field of catalytic hydrogenolysis α, can solve the problems of copper chromium oxide catalyst environmental pollution, etc., and achieve the effect of mild reaction conditions and simple operation

Inactive Publication Date: 2005-05-18
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reaction needs to be carried out at a higher temperature (180 ° C), and the copper chromium oxide catalyst has the problem of environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Get α, α-dimethyl benzyl alcohol 0.2g, 2%wtPd / C catalyst 0.1g, formic acid solution (formic acid: water=3: 12) 5ml, 10ml ethanol is solvent, joins in the Erlenmeyer flask with grinding mouth, stirs Heat to reflux at 60°C for 4 hours. After the reaction, the catalyst was centrifuged, and the reaction mixture was chromatographically analyzed by internal standard method. The conversion of α,α-dimethylbenzyl alcohol was 96%, and the selectivity of cumene was 99%.

Embodiment 2

[0025] Take 0.2g of α, α-dimethylbenzyl alcohol, 0.1g of 2%wtPd / C catalyst, 5ml of 2-propanol solution, and 10ml of tert-butanol as solvent, add them to a ground-neck Erlenmeyer flask, and heat to 60°C under stirring Reflux for 4 hours. After the reaction, the catalyst was centrifuged, and the reaction mixture was chromatographically analyzed by internal standard method. The conversion rate of α,α-dimethylbenzyl alcohol was 6.4%, and the selectivity of cumene was 65.8%.

Embodiment 3

[0027] Take 0.2g of α,α-dimethylbenzyl alcohol, 0.02g of 2%wtPd / C catalyst, 5ml of acetic acid, and 10ml of ethanol as a solvent, add them to a 0.15L stainless steel reaction kettle, and feed hydrogen into the kettle until the pressure reaches After 250kPa, the reactor was heated in an oil bath at 30°C, and catalytic hydrogenolysis was carried out for 2 hours under stirring. After the reaction, the catalyst was centrifuged, and the reaction mixture was chromatographically analyzed by internal standard method. The conversion rate of α,α-dimethylbenzyl alcohol was 98%, and the selectivity of cumene was 99%.

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Abstract

The present invention hydrogenolyzes alpha, alpha-dimethyl benzyl alcohol in solvent into isopropyl benzene with hydrogen or organic compound as hydrogen source at reaction temperature of 30-100 deg.c under multiphase Pd base catalyst. The present invention has alpha, alpha-dimethyl benzyl alcohol converting rate greater than 96 % and isopropyl benzene selectivity greater than 99 %. The said process may be used in the hydrogenolysis of alpha, alpha-dimethyl benzyl alcohol as the co-product of propylene epoxidation process to prepare propylene oxide with cumene hydroperoxide as oxidant to realize circular utilization of isopropyl benzene. The said technology may be used in recovering propylene from tail gas generated in the process of producing propylene chloride or polypropylene, and may be also used in the propylene oxide producing line.

Description

technical field [0001] The invention relates to a method for preparing cumene, in particular to a method for preparing cumene by catalytic hydrogenolysis of α,α-dimethylbenzyl alcohol. Background technique [0002] Cumene is an important organic chemical raw material, which can be used to prepare phenol and acetone, and can also be used as a component of high antiknock gasoline to improve the quality of gasoline. [0003] Propylene oxide (PO) is also an important basic organic chemical raw material. At present, it is mainly produced by the chlorohydrin method and the Halcon method (indirect oxidation method) in industry. The Halcon method uses organic peroxides as oxidants to epoxidize propylene to obtain propylene oxide, and a large number of co-products are generated. If propylene oxide is produced by epoxidizing propylene oxide with cumene hydroperoxide as an oxidant, its co-product is α, α-dimethylbenzyl alcohol, which can be generated by catalytic hydrogenolysis to cum...

Claims

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Application Information

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IPC IPC(8): C07C1/20C07C15/085
Inventor 卢冠忠刘晓晖王筠松郭杨龙郭耘张志刚
Owner EAST CHINA UNIV OF SCI & TECH
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