Process system for synthesizing hexamethylenediamine key intermediate

Abstract

The invention relates to a process system for synthesizing a hexamethylenediamine key intermediate. The process system comprises preheaters, reactors, separators, product collecting devices and material recovery devices, wherein the preheaters include a first preheater and a second preheater; the reactors include a first reactor and a second reactor; the separators include a first separator and asecond separator; the product collecting devices include a first product collecting device and a second product collecting device; the material recovery devices include a first material recovery device and a second material recovery device; the first preheater, the first reactor, the first separator and the first product collecting device are sequentially connected, and the first material recoverydevice is connected with the first separator; the second preheater, the second reactor, the second separator and the second product collecting device are sequentially connected, and the second material recovery device is connected with the second separator; and the second preheater is connected with the first product collecting device. The system is simple and optimized, the raw material utilization rate and the product selectivity can be improved, and the production cost is reduced.

Description

technical field [0001] The invention relates to the technical field of organic chemical industry, in particular to a process system for synthesizing a key intermediate of hexamethylenediamine, especially suitable for synthesizing 6-aminocapronitrile, a key intermediate of hexamethylenediamine. Background technique [0002] Hexamethylenediamine is an important chemical raw material, mainly used in the production of nylon 66, nylon 610 and diisocyanate (HDI). At present, the method for producing hexamethylenediamine mainly includes the production method carried out through the intermediate adiponitrile and the production method carried out through the intermediate 6-aminocapronitrile, wherein, the method for producing hexamethylenediamine is carried out by preparing the intermediate adiponitrile The cost is high. In the method for producing hexamethylenediamine through the intermediate 6-aminocapronitrile, the direct ammoniation of caprolactam is mainly used to synthesize 6-a...

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Problems solved by technology

[0004] patent CN201710942344.8 provides a method for preparing 6-aminocapronitrile by gas phase method, using caprolactam as raw material, and caprolactam steam and hot ammonia gas in a certain mass ratio Mixing; the obtained mixture of caprolactam vapor and hot ammonia gas is subjected to ammoniation dehydration reaction in the presence of a catalyst to obtain an ammoniated effluent; the obtained ammoniated effluent is separated and purified to obtain pure 6-amino Capronitrile: In this method, caprolactam is dehydrated in the reaction process to generate 6-aminocapronitrile, and a small amount of water promotes the polymerization of caprolactam at high temperature, while the polymer produced by caprolactam polymerization will coke and adhere to the surface of the catalyst, reducing catalyst activity and service life. Affect the normal operation of the reaction device, thereby affecting the response efficiency of the whole set of questions

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