Cyclohexanone preparation method and method for preparing oxime through cyclohexanone ammoximation reaction

A technology of cyclohexanone and cyclohexane, applied in the field of preparation of cyclohexanone, can solve the problems of low cyclohexanone conversion rate of cyclohexanone, low selectivity of cyclohexanone, poor treatment effect, complicated process flow, etc. The effect of high conversion rate and simple preparation process

Inactive Publication Date: 2015-05-27
YUEYANG CHANGDE CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects of poor nitrous oxide treatment effect, low cyclohexane conversion rate and cyclohexanone selectivity and complicated technical process in the prior art, and provide a new preparation method of cyclohexanone. The method can not only expand the application range of nitrous oxide, but also can effectively improve the conversion rate of cyclohexane and the selectivity of cyclohexanone while increasing the added value of nitrous oxide and reduce the cost

Method used

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  • Cyclohexanone preparation method and method for preparing oxime through cyclohexanone ammoximation reaction
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  • Cyclohexanone preparation method and method for preparing oxime through cyclohexanone ammoximation reaction

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[0012] The invention provides a method for preparing cyclohexanone, wherein the method comprises: contacting dinitrogen monoxide and cyclohexane with a catalyst.

[0013] General reaction formula of the present invention is:

[0014]

[0015] According to the method of the present invention, the molar ratio of nitrous oxide to cyclohexane may be 1:2-12. The inventors of the present invention have found that the conversion rate of dinitrogen monoxide and the selectivity of cyclohexanone all increase with the increase of the molar ratio of cyclohexane and dinitrogen monoxide in the raw material, but when the cyclohexane and dinitrogen monoxide When the molar ratio of nitrogen is greater than 6:1, the conversion rate of nitrous oxide does not increase significantly, therefore, preferably, the molar ratio of nitrous oxide to cyclohexane is 1:4-6.

[0016] According to the method of the present invention, the contacting of the nitrous oxide and cyclohexane with the catalyst is ...

Embodiment 1

[0055] This example is used to illustrate the preparation method of cyclohexanone provided by the present invention.

[0056] Helium, nitrous oxide and cyclohexane were added to the Fe-ZSM-5 catalyst in a molar ratio of 9:1:6 (the weight ratio of iron to ZSM-5 molecular sieve was 1:200, SiO 2 / Al 2 o 3 The molar ratio is 500, the particle size of the molecular sieve is 20 mesh) in the fixed fluidized bed reactor, the reaction temperature is controlled at 400°C, the pressure is controlled at normal pressure, and the total volume space velocity of the feed is 7000h -1 .

Embodiment 2

[0058] This example is used to illustrate the preparation method of cyclohexanone provided by the present invention.

[0059] Helium, nitrous oxide and cyclohexane were added to the Fe-ZSM-5 catalyst with a molar ratio of 9:1:5 (the weight ratio of iron to ZSM-5 molecular sieve was 1:200, SiO 2 / Al 2 o 3 The molar ratio is 500, the particle size of the molecular sieve is 20 mesh) in the fixed fluidized bed reactor, the reaction temperature is controlled at 430°C, the pressure is controlled at normal pressure, and the total volume space velocity of the feed is 5000h -1 .

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Abstract

The invention discloses a cyclohexanone preparation method and a method for preparing oxime through cyclohexanone ammoximation reaction. The method is characterized in that nitrous oxide and cyclohexane are contacted with a catalyst. By employing the cyclohexanone prepared by the invention, nitrous oxide conversion rate can reach more than 85%, and cyclohexane conversion rate can reach higher than 20%. Accordingly, by using the method for preparing cyclohexanone, added value of nitrous oxide can be effectively increased, cyclohexane conversion rate and cyclohexanone selectivity can be increased, and the preparation technology is simple.

Description

technical field [0001] The invention relates to a preparation method of cyclohexanone and a method for preparing ketoxime by oximating ketoamine. Background technique [0002] Nitrous oxide (Nitrous Oxide), also known as laughing gas, is a gas with a greenhouse effect and one of the six greenhouse gases stipulated in the Kyoto Protocol. Compared with carbon dioxide, although the content of nitrous oxide in the atmosphere is very low, its single-molecule warming potential is 310 times that of carbon dioxide. Therefore, the effect on the global greenhouse effect is obvious, and the increase in the concentration of nitrous oxide in the atmosphere has caused great concern in various regions and countries around the world. However, in the industrial production of caprolactam, a large amount of nitrous oxide is often produced during the ammoximation reaction catalyzed by titanium-silicon molecular sieves, and direct discharge will cause serious damage to the environment. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/28C07C49/403C01B21/22
CPCC07C45/28C07C219/04C07C251/20C07C2601/14
Inventor 蒋卫和彭鹏祥林民袁年武郑宏翠王德清杨浴姜红军汪夑卿
Owner YUEYANG CHANGDE CHEM IND
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