Chromaticity alarm and interlocking method of cyclohexanone ammoximation process under the condition of mixed catalyst

A mixed catalyst and cyclohexanone ammonia oxime technology, which is applied in oxime preparation, organic chemistry, chemical recovery, etc., can solve problems such as poor safety, and achieve the effects of preventing explosion accidents, ensuring safety, and avoiding unplanned parking

Active Publication Date: 2020-03-31
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The technical problem to be solved by the present invention is the problem of poor safety in the prior art, and a new chromaticity alarm and interlocking method for the cyclohexanone ammoximation process under the condition of a mixed catalyst is provided

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A chromaticity alarm and interlocking method for a cyclohexanone ammoximation process under the condition of a mixed catalyst, using a titanium-silicon molecular sieve catalyst, and the mixed catalyst is a mixture of a fresh catalyst and a regenerated catalyst, wherein the mass ratio of the fresh catalyst to the regenerated catalyst is 8: 2. The regenerated catalyst is a catalyst that can be reused after washing, cooking, tert-butanol cleaning, drying or roasting after the deactivation of the fresh catalyst. Its catalytic activity is 80% of that of the fresh catalyst. During the deactivation process of the mixed catalyst, ammonia oxime The chromaticity alarm value of the supernatant liquid in the chemical reactor is 150°, and the interlock value is 250°. When the chromaticity reaches the alarm value of 150°, the operator should replenish the fresh catalyst to the reaction system within 60 minutes. When the temperature reaches the interlock value of 250°, the control sys...

Embodiment 2

[0021] A chromaticity alarm and interlocking method for the cyclohexanone ammoximation process under the condition of a mixed catalyst, using a titanium-silicon molecular sieve catalyst, and adding fresh catalyst to the active catalyst as the reaction conversion rate decreases to 95%. Catalyst mixture, wherein the mass of fresh catalyst added is 10%% of the catalyst in the system. During the catalyst deactivation process, the chromaticity alarm value of the clear liquid of the ammoximation reactor is 200°, and the interlock value is 300°; when the chromaticity reaches When the alarm value is 200°, the operator should replenish fresh catalyst to the reaction system within 30 minutes. The replenishment amount is 30% of the amount of catalyst in the reaction system, which can effectively reduce the chroma of the reaction liquid; when the chroma reaches the interlock When the value is 300°, the control system should immediately start the interlock control measures, cut off the feed...

Embodiment 3

[0023] A chromaticity alarm and interlocking method for a cyclohexanone ammoximation process under the condition of a mixed catalyst, using a titanium-silicon molecular sieve catalyst, and the mixed catalyst is a mixture of a fresh catalyst and a regenerated catalyst, wherein the mass ratio of the fresh catalyst to the regenerated catalyst is 9: 1; The regenerated catalyst is a catalyst that can be reused after washing, cooking, tert-butanol cleaning, drying or roasting after the deactivation of the fresh catalyst, and its catalytic activity is 90% of the fresh catalyst. During the deactivation process of the mixed catalyst, ammonia The alarm value of the chroma of the clear liquid in the oximation reactor is 100°, and the interlock value is 200°; when the chroma reaches the alarm value of 100°, the operator should replenish the reaction system with fresh catalyst within 1 hour, and the replenishment amount is 10% of the amount of catalyst in the reaction system can effectively...

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PUM

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Abstract

The invention relates to a chromaticity alarming and interlocking method of a cyclohexanone ammoximation process under the condition of using a mixed catalyst, and mainly solves the problem of poor safety in the prior art. With the adoption of the method, in a process device for producing cyclohexanone oxime by oxidizing cyclohexanone with hydrogen peroxide, under the condition of using the mixed catalyst and in a process of inactivation of the catalyst, an alarm value of chromaticity of clear liquid of an ammoximation reaction is set as 150 degrees-200 degrees, and an interlocking value is set as 200 degrees-400 degrees; when the chromaticity of the clear liquid of the ammoximation reaction reaches the alarm value, an operation of replenishing the fresh catalyst is adopted; when the chromaticity of the clear liquid of the ammoximation reaction reaches the interlocking value, an interlocking action of a control system is started, and the feeding of the hydrogen peroxide, cyclohexanone and ammonia can be cut off; according to the technical scheme that nitrogen filled protection is achieved by a reactor, the problem can be better solved, and the technical scheme can be used in the cyclohexanone ammoximation process.

Description

technical field [0001] The invention relates to a chromaticity alarm and interlocking method for a cyclohexanone ammoximation process under the condition of a mixed catalyst. Background technique [0002] Caprolactam is a monomer of synthetic fibers and engineering plastics, and has always been an important chemical raw material in short supply in the market in my country. At present, most of the production of caprolactam adopts the process route of converting cyclohexanone into cyclohexanone oxime and rearranging into caprolactam. The process of preparing cyclohexanone oxime by direct ammoxidation of cyclohexanone used in the conversion from cyclohexanone to cyclohexanone oxime is a green, environment-friendly and low-energy-consumption process. The new process of cyclohexanone ammonia oxime synthesis cyclohexanone oxime is to use cyclohexanone, ammonia and hydrogen peroxide under low pressure conditions, tert-butanol as solvent, and use titanium silicon molecular sieve ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C249/04C07C251/44
CPCC07C249/04C07C251/44Y02P20/584
Inventor 徐伟张晨石宁黄飞李永祥张帆费轶
Owner CHINA PETROLEUM & CHEM CORP
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