Heat recovery type ammoximation reaction system of fixed bed

Abstract

The invention discloses a heat recovery type ammoximation reaction system of a fixed bed. The heat recovery type ammoximation reaction system of the fixed bed comprises a reaction clear liquid buffering tank, a reaction circulating pump, an oximation pre-reactor and an oximation reactor, wherein a discharging opening of the reaction clear liquid buffering tank is connected to a feeding opening ofthe reaction circulating pump through a pipeline; a discharging opening of the reaction circulating pump is connected with a feeding opening of the oximation pre-reactor through a reaction circulatingliquid pipeline; a discharging opening of the oximation pre-reactor is connected to a feeding opening of the oximation reactor through a reaction liquid feeding pipeline; and a discharging opening ofthe oximation reactor is connected to a feeding opening of the reaction clear liquid buffering tank through a reaction liquid discharging pipeline. After passing through the oximation pre-reactor andthe oximation reactor, a material directly enters the reaction clear liquid buffering tank, devices such as a catalyst replenishing device, an unloading device, an oximation reaction kettle and a membrane tube of the ammoximation reaction system are simplified, the running cost is reduced, reaction heat recovery is achieved by a pipe type fixed bed layer, and configurations such as a membrane tube filter and a large oximation reaction kettle are eliminated.

Description

Technical field [0001] The invention belongs to the technical field of chemical engineering, and particularly relates to a fixed bed heat recovery type ammoximation reaction system. 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 ammoximation method (HAO method). Among them, the HSO method and the NO method have complex processes and by-produce low-value ammonium sulfate; although the HPO method does not by-produce ammonium sulfate, the process requires fine, difficult operation, and NO x There are environmental problems. At present, the HSO method and NO method have been gradually eliminated. The mainstream method of caprolactam production in my country is the HAO method. The main method of this ...

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Problems solved by technology

[0005] Finally, it is impossible to take into account both the convenient maintenance of the oximation reactor and the rapid increase in production capacity

The external ceramic membrane tube can improve the production capacity, but the membrane tube needs to be frequently washed with alkali and acid during the production process, which produces a large amount of waste water, and the ceramic membrane will have a large proportion due to its inherent weakness (low strength). loss

The stainless steel membrane tube is placed in the reactor. Once the membrane tube is blocked, the operation must be stopped, and the membrane tube should be washed with alkali or replaced, which will affect the normal production.

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