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Process for producing cyclohexylbenzene

A technology for cyclohexylbenzene and cyclohexene is applied in the field of preparation of cyclohexylbenzene, and can solve the problems of high corrosiveness of catalysts, decreased activity and rate of alkylation reactions, expensive alkylation reagents, and the like.

Inactive Publication Date: 2008-07-16
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that when the catalyst used is reused, the activity and rate of the alkylation reaction will decrease significantly.
[0006] CN 1982264A and CN 1982263A disclose the method for preparing cyclohexylbenzene by alkylation reaction of benzene and halocyclohexane or cyclohexanol respectively, but they have the common defect that the price of the alkylating agent used is expensive and the catalyst used Corrosive

Method used

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  • Process for producing cyclohexylbenzene
  • Process for producing cyclohexylbenzene
  • Process for producing cyclohexylbenzene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In a 500ml jacketed reactor, a super constant temperature tank is used for heating in a water bath, and an electric stirring paddle is used for stirring. The rotation speed is greater than 500 rpm, which is enough to eliminate mass transfer and heat transfer resistance. In the reactor, add 262.2 grams of benzene, 18.4 grams of cyclohexene, 15 grams of Et 3 NHCl-ZnCl 2 Ionic liquid, react at 60°C. After 30 minutes of reaction, the conversion of cyclohexene was 100%. After the catalyst was separated from the product, atmospheric distillation was carried out to remove excess benzene, and vacuum distillation was carried out to obtain 34.0 g of colorless liquid fractions with a product yield of 94.9%. The product was analyzed by GC-MS, and the purity of the cyclohexylbenzene product was found to be 99.8%.

[0025] The peaks of 104 and 160 appear in the MS spectrum, which are respectively knocked out (-CH 2 ) 4 The final fragment peak and the molecular ion peak of cycloh...

Embodiment 2

[0027] The basic steps are the same as in Example 1, and the catalyst is 15 grams of [bmin]Br-AlCl 3 Ionic liquid ([bmin]Br is 1-butyl-3-methylimidazolium bromide salt, the same below). After 30 minutes of reaction, the conversion of cyclohexene was 100%. After the catalyst was separated from the product, atmospheric distillation was carried out to remove excess benzene, and vacuum distillation was carried out to obtain 34.2 g of colorless liquid fractions with a product yield of 95.4%. The product is analyzed by GC-MS, and the purity of the cyclohexylbenzene product is 99.9%.

Embodiment 3

[0029] The basic steps are the same as in Example 1, and the temperature is 40°C. After 60 minutes of reaction, the conversion of cyclohexene was 99.8%. After the catalyst was separated from the product, atmospheric distillation was carried out to remove excess benzene, and vacuum distillation was carried out to obtain 33.8 g of colorless liquid fractions with a product yield of 94.3%. The product is analyzed by GC-MS, and the purity of the cyclohexylbenzene product is 99.85%.

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Abstract

The invention relates to a method for preparing cyclohexylbenzene by benzene and cyclohexene through alkylation reaction, comprising the main step that under the condition with a catalyst, target substance is prepared by the benzene and the cyclohexene through the alkylation reaction; the invention is characterized in that the catalyst is imidazole ionic liquid or triethylamine hydrochloride ionic liquid. The invention overcomes the defects that the catalyst in the prior art can not be repeatedly used or the reaction activity decreases after repeated usage.

Description

technical field [0001] The invention relates to a method for preparing cyclohexylbenzene, in particular to a method for preparing cyclohexylbenzene by alkylation reaction of benzene and cyclohexene. Background technique [0002] Cyclohexylbenzene is an important chemical intermediate and additive. Can make phenol and pimelinketone as by oxidation cyclohexylbenzene; Cyclohexylbenzene also can be used for the additive (CN 1632983A, CN 1430306 and CN 1475038 etc.) safety performance. In addition, cyclohexylbenzene can also be used to prepare liquid crystal materials (CN1318617). [0003] In the presence of a catalyst, cyclohexylbenzene is produced through the alkylation reaction of benzene with an alkylating agent (such as cyclohexene, cyclohexanol, and halocyclohexane, etc.), which is a commonly used preparation method at present. Cyclohexylbenzene method. [0004] US 3,760,018 and US 3,760,019 disclose a method using a supported catalyst (Me / SiO 2 -Al 2 o 3 , Me is met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C13/72C07C2/66B01J31/02B01J31/18B01J31/26
CPCY02P20/52Y02P20/584
Inventor 方云进郭欢欢
Owner EAST CHINA UNIV OF SCI & TECH
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