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Method for preparing cyclohexane by hydrogenating benzene

A technology for the hydrogenation of cyclohexane and benzene, which is applied in the fields of hydrogenation to hydrocarbons, chemical instruments and methods, organic compounds/hydrides/coordination complex catalysts, etc., and can solve problems such as low conversion rate, high reaction temperature and reaction pressure , to achieve the effects of easy separation, mild process operating conditions, and simplified process flow

Active Publication Date: 2014-06-18
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a method for preparing cyclohexane by hydrogenation of benzene, which solves the problems of high reaction temperature and reaction pressure and low conversion rate in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Use a graduated cylinder to measure 20ml of benzene and pour it into the reaction kettle. The amount of catalyst added is 0.001% (based on the amount of Ru), then add 20ml of water, and react at a reaction temperature of 70°C, a reaction pressure of 1.0MPa, and stirring at 400 rpm. After 3 hours, a sample was taken for gas chromatography analysis. The conversion rate of benzene was 92.89%, and the selectivity of cyclohexane was 100%.

Embodiment 2

[0022] Use a graduated cylinder to measure 20ml of benzene and pour it into the reaction kettle. The amount of catalyst added is 0.003% (based on the amount of Ru), then add 20ml of water, and react at a reaction temperature of 80°C, a reaction pressure of 1.0MPa, and stirring at 600 rpm. Hours, samples were taken for gas chromatographic analysis, the conversion rate of benzene was 98.12%, and the selectivity of cyclohexane was 100%.

Embodiment 3

[0024] Use a graduated cylinder to measure 20ml of benzene and pour it into the reaction kettle. The amount of catalyst added is 0.008% (based on the amount of Ru), and then 40ml of water is added, and the reaction is carried out at a reaction temperature of 100°C, a reaction pressure of 0.8MPa, and stirring at 400 rpm. After 4 hours, a sample was taken for gas chromatography analysis. The conversion rate of benzene was 99.69%, and the selectivity of cyclohexane was 100%.

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Abstract

The invention relates to a method for preparing cyclohexane by hydrogenating benzene. The method comprises the following steps: allowing benzene to contact and react with hydrogen at a temperature of 50-100DEG C under a pressure of 0.3-2.0MPa under a stirring speed of 200-700rpm for 1-8h, and separating the obtained reaction liquid to obtain a hydrogenation product. A catalyst used in the method is composed of [RMIm][RuCl4], [RMIm][CoCl3] and [RMIm][AlCl4], and a molar ratio of [RMIm][RuCl4]:[RMIm][CoCl3]:[RMIm][AlCl4] is 1:2-4:6-12; and R is an ethyl group or a butyl group, MIm is a methylimidazole group, the addition amount of the catalyst by Ru accounts for 0.001-0.018% of the mass of benzene, and the amount of a dispersion solvent is 1.0-3.0 times the mass of benzene. The method enables the benzene conversion rate to reach 100% and the cyclohexane selectivity to reach 100%.

Description

technical field [0001] The invention relates to a method for preparing cyclohexane by hydrogenating benzene. Background technique [0002] Cyclohexane is an important organic chemical raw material, 90% of which is used to produce adipic acid and caprolactam. In addition, cyclohexane is also an excellent solvent for cellulose ether, resin, wax, grease, asphalt and rubber, a medium for organic synthesis and crystallization, and a remover for paint and varnish. The methods for industrial production of cyclohexane can be divided into two categories: benzene hydrogenation and fractional distillation of petroleum hydrocarbon fractions. At present, the industrial catalytic benzene hydrogenation method is the main production method of cyclohexane, which can be divided into gas-phase catalytic method and liquid-phase catalytic method. At present, the commonly used catalysts are supported type and Ziegler Natta type, and the reaction is carried out under higher temperature and press...

Claims

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Application Information

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IPC IPC(8): C07C13/18C07C5/10B01J31/22
CPCY02P20/52
Inventor 石鸣彦李民程光剑黄集钺翟国栋贺俊海吕洁曹微邸大鹏王永梅崔欣
Owner PETROCHINA CO LTD
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