Ammoximation reaction and separation coupling process and device

Abstract

The invention discloses an ammoximation reaction and separation coupling process which comprises the following steps: continuously adding reaction raw materials and a solvent in different groups outside a reaction kettle into a pipeline reactor for reaction, mixing the components in a mixer, and subsequently feeding the mixture into the reaction kettle for sufficient reaction, wherein the upper part of the reaction kettle is a reaction zone, and the lower part of the reaction kettle is a filtration separation zone; separating a reaction product, namely, cyclohexanone-oxime from a catalyst in the filtration separation zone, feeding the separated cyclohexanone-oxime into a later process, and circulating the catalyst back to the reaction kettle for continuous reaction through equipment such as the pipeline reactor outside the reaction kettle. Backwashing is performed once every 10-300 seconds, so that the continuity of reaction separation is ensured. As the raw materials sufficiently contact the catalyst, the reaction is complete, and the conversion rate of cyclohexanone can be 99.9-100%. The whole set of reaction separation devices is reasonable in arrangement and stable in reaction.

Description

technical field [0001] The invention relates to an ammoximation reaction process, in particular to a reaction and separation coupling process for preparing cyclohexanone oxime by ammoximation. Background technique [0002] Cyclohexanone oxime is an important raw material for the preparation of caprolactam. The processes for preparing cyclohexanone oxime mainly include HSO method (hydroxylamine sulfate method), HPO method (hydroxylamine phosphate method), NO reduction method and ammoximation method. The NO reduction method and the HSO method are less and less used due to the low value of the by-products; the HPO method is gradually replaced by the cyclohexanone ammoximation method in industrial production due to its complicated process and difficult operation. The cyclohexanone ammoximation process has more and more industrial applications due to its simple process, easy operation and few by-products. The cyclohexanone ammoximation method refers to the reaction of cyclohexa...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the reaction feed liquid needs to be transported to the outside of the reactor, resulting in increased energy consumption. During the transport of the catalyst, the shear of the pump will cause the catalyst to wear, resulting in a decline in catalyst performance and catalyst loss.

Another ammoximation reaction separation process is that the filter is in the reactor, and the cyclohexanone ammoximation is reacting while the reaction product is separated from the catalyst. The biggest disadvantage of this separation method is that the reaction material is easy to short circuit. Some reaction raw materials are removed from the reactor together with the reaction product without reaction, resulting in low reaction conversion rate and serious back-mixing in the reactor.

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