Catalyst separation device for cyclohexanone ammoximation reaction

Abstract

The invention discloses a catalyst separation device for cyclohexanone ammoximation reaction. The catalyst separation device comprises a reaction system and an outer filter cycling system, wherein the reaction system is connected with the outer filter cycling system through a pipeline; the reaction system comprises a reaction tank body and a stirrer which is arranged inside the tank body, the tank body is also provided with a raw material inlet and a reaction liquid outlet; the outer filter cycling system comprises a membrane filter and a heat exchanger, the membrane filter comprises a membrane filter inlet, a filter liquid outlet, a clear liquid outlet and a back-washing inlet, and the heat exchanger comprises a heat exchanger outlet and a heat exchanger inlet; the reaction liquid outlet is connected with the membrane filter inlet, the filter liquid outlet of the membrane filter is connected with the heat exchanger inlet, and the heat exchanger outlet is connected with the raw material inlet. The catalyst separation device is suitable for the cyclohexanone ammoximation reaction and for separating the catalyst, and a pre-filtering device is added, so that the load of the membrane filter can be reduced, and not only can the continuity for filtering the catalyst be guaranteed, but also the quantity and investment of the membrane filter pipes can be reduced.

Description

technical field [0001] The invention relates to a catalyst separation device, in particular to a catalyst separation device for the ammoximation reaction of cyclohexanone, which belongs to the technical field of chemical industry. Background technique [0002] Cyclohexanone oxime is an important intermediate for the preparation of caprolactam. At present, the methods for preparing cyclohexanone oxime in the world mainly include hydroxylamine sulfate method (HSO method), nitric oxide reduction method (NO method), hydroxylamine phosphate method (HPO method) and ammonia oximation method (HAO method). Among them, the HSO method and the NO method have complex processes and low-value ammonium sulfate by-products; although the HPO method does not produce ammonium sulfate by-products, the process requires fine craftsmanship, the operation is difficult, and there is NO x Produced, there is an environmental protection problem. At present, cyclohexanone oxime is mainly prepared by cy...

AI Technical Summary

Problems solved by technology

Although the above-mentioned methods have solved the problem of catalyst separation in the reaction solution, the built-in membrane filter causes the effective volume of the reactor to decrease and increases the investment in equipment.

Using static filtration, the separation effect is too slow, which is not conducive to continuous production

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