Catalytic oxidation method of cyclohexane

A technology for catalytic oxidation and cyclohexane, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problems of low conversion rate of cyclohexane, low selectivity of alcohol and ketone, and low efficiency, and achieve The production process is simple, the selectivity of cyclohexane hydroperoxide is high, and the effect of overcoming the complex production process

Inactive Publication Date: 2015-01-21
王晓伟
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this production process is also considered to be the least efficient of all chemical industrial processes, and there are common problems such as low conversion rate of cyclohexane, low selectivity of alcohols and ketones, and serious three wastes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] At a temperature of 60°C and a pressure of 2.0 MPa, with a mixed gas (composed of ozone and carbon dioxide) as the oxidant, TiO 2 As a catalyst, the molar ratio of catalyst to cyclohexane is 1:40, and cyclohexane, ozone, and carbon dioxide are reacted in the solvent methanol for 5 hours according to the molar ratio of 1:1:5, and the conversion rate of cyclohexane is 87%. , Cyclohexanone selectivity 89.4%.

Embodiment 2

[0023] At a temperature of 30°C and a pressure of 1.0 MPa, with pure ozone as the oxidant and Ti-MCM-41A as the catalyst, the molar ratio of the catalyst (calculated as titanium dioxide) to cyclohexane is 1:60, and the cyclohexane , ozone, and nitrogen were reacted in the solvent ethanol for 8 hours according to the molar ratio of 1:5:20, the conversion rate of cyclohexane was 83%, and the selectivity of cyclohexanone was 85.2%.

Embodiment 3

[0025] At a temperature of 100°C and a pressure of 0.5 MPa, a mixed gas (composed of ozone and nitrogen) is used as the oxidant, TS-1 is used as the catalyst, and the molar ratio of the catalyst (the catalyst is calculated as titanium dioxide) to cyclohexane is 1: 80. Cyclohexane, ozone, and nitrogen were reacted in the solvent acetonitrile at a molar ratio of 1:10:50 for 15 hours. The conversion rate of cyclohexane was 89%, and the selectivity of cyclohexanone was 90.1%.

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PUM

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Abstract

The invention discloses a catalytic oxidation method of cyclohexane for preparation of cyclohexanone. According to the method, at the temperature of 0-180 DEG C and at the pressure of 0.1-3.0 MPa, cyclohexane, an oxidizing agent, a solvent and a catalyst are mixed and contacted with each other to carry out a reaction, wherein the oxidizing agent is pure ozone or a gas mixture of pure ozone and diluent gas. The method provided by the invention has higher cyclohexane conversion rate and cyclohexanone selectivity.

Description

technical field [0001] The invention relates to a method for preparing cyclohexanone by catalytically oxidizing cyclohexane, more particularly to a method of using TiO 2 Or a method for preparing cyclohexanone by catalyzing the oxidation of cyclohexane with titanium-containing zeolite as a catalyst. Background technique [0002] Cyclohexanone is an important organic chemical raw material, which is widely used in industries such as fiber, synthetic rubber, industrial coating, medicine, pesticide and organic solvent, and is also widely used in printing and plastic recycling. [0003] At present, the production process route of cyclohexanone in the world mainly contains three kinds according to raw materials: cyclohexane liquid-phase air oxidation method, phenol hydrogenation method and benzene partial hydrogenation method, wherein cyclohexane oxidation method accounts for more than 90%. However, this production process is also considered to be the least efficient of all chemi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C49/403C07C45/40
CPCC07C45/53C07C45/40C07C2601/14
Inventor 王晓伟
Owner 王晓伟
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