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Method for oxidation of cyclohexane

A technology for oxidizing cyclohexane and cyclohexane, which is applied in the field of oxidizing cyclohexane, can solve the problems of low cyclohexane conversion rate and cyclohexanol selectivity, and achieves environmental friendliness, high conversion rate, and is beneficial to industrial production and application. Effect

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still problems such as low conversion rate of cyclohexane and low selectivity of cyclohexanol

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Cyclohexane, hydrogen peroxide (in this example, hydrogen peroxide is provided in the form of 30% by weight hydrogen peroxide aqueous solution, the following examples are similar), liquid ammonia, solvent methanol and catalyst (TS-1) according to the cyclohexane The molar ratio of hexane to hydrogen peroxide is 1:2, the molar ratio of liquid ammonia to hydrogen peroxide is 0.05:1, the weight ratio of solvent methanol to catalyst is 20:1, and the weight ratio of cyclohexane to catalyst is 20: 1. Carry out the reaction at a temperature of 30°C and a pressure of 1.5MPa.

[0036] The results of the reaction for 6 hours were as follows: the conversion rate of cyclohexane was 47%, the selectivity of cyclohexanol was 64%, and the selectivity of cyclohexanone was 34%.

Embodiment 2

[0041] Mix cyclohexane, hydrogen peroxide, liquid ammonia, solvent methanol and catalyst (TS-1) according to the molar ratio of cyclohexane to hydrogen peroxide is 1:2, and the molar ratio of liquid ammonia to hydrogen peroxide is 0.005:1 , the weight ratio of the solvent methanol to the catalyst is 120:1, the weight ratio of cyclohexane to the catalyst is 40:1, and the reaction is carried out at a temperature of 30° C. and a pressure of 1.5 MPa.

[0042] The results of the reaction for 2 hours were as follows: the conversion rate of cyclohexane was 28%, the selectivity of cyclohexanol was 63%, and the selectivity of cyclohexanone was 36%.

Embodiment 3

[0047] Mix cyclohexane, hydrogen peroxide, liquid ammonia, solvent acetone and catalyst (TS-1) according to the molar ratio of cyclohexane to hydrogen peroxide is 1:5, and the molar ratio of liquid ammonia to hydrogen peroxide is 0.01:1 , the weight ratio of the solvent acetone to the catalyst is 200:1, the weight ratio of cyclohexane to the catalyst is 80:1, and the reaction is carried out at a temperature of 60° C. and a pressure of 1.0 MPa.

[0048] The results of the reaction for 4 hours were as follows: the conversion rate of cyclohexane was 81%, the selectivity of cyclohexanol was 68%, and the selectivity of cyclohexanone was 31%.

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Abstract

The invention relates to a method for the oxidation of cyclohexane. The method comprises the step of enabling a liquid-phase mixture containing cyclohexane and hydrogen peroxide to contact a titanium-silicon molecular sieve under the oxidation reaction condition. The method is characterized in that the liquid-phase mixture further contains at least one alkali with the pKb being more than or equal to 4.5, and the molar ratio of the alkali to the hydrogen peroxide is (0.0001-0.1):1. The method provided by the invention is an environment-friendly synthesis process, is environment-friendly and is suitable for industrial production and application. In addition, the production process is easy to control, the catalytic oxidation activity is high, the selectivity of cyclohexanol is good, and the total selectivity of alcohol ketone is increased.

Description

technical field [0001] The present invention relates to a method for oxidizing cyclohexane. Background technique [0002] Cyclohexanol, also known as hexahydrophenol, is a colorless, oily, flammable liquid that appears as white crystals below its freezing point. The melting point is 24°C (freezing point is 25.15°C), the boiling point is 161.10°C, and the relative density is 0.9493 (20 / 4°C). It is miscible with ethanol, ethyl acetate, linseed oil, aromatic hydrocarbons, ether, acetone, chloroform and other organic solvents, and slightly soluble in water. The explosion limit of mixing with air is 1.52%-11.1% (volume). It has a camphor-like odor and is hygroscopic. [0003] Cyclohexanol is an important chemical raw material, mainly used in the production of adipic acid, hexamethylenediamine, cyclohexanone, and caprolactam. It can also be used as a stabilizer for soap, to make disinfectant soaps and detergent emulsions, and to be used as rubber, resin, Solvents for nitrocell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C27/16C07C49/403C07C35/08C07C45/28C07C29/48
CPCC07C29/48C07C45/28C07C2601/14C07C35/08C07C49/403
Inventor 史春风林民朱斌
Owner CHINA PETROLEUM & CHEM CORP
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