Method for producing 2,6-dichloro p-nitroaniline and special reactor thereof

Abstract

The invention relates to a method for producing 2, 6-dichloro-p-nitroaniline and a special reaction kettle thereof. The method is as follows: nitroaniline and chlorine gas are subjected to substitution reaction in a medium of concentrated hydrochloric acid to generate the 2, 6-dichloro-p-nitroaniline, in particular, the substitution reaction is carried out in a large-volume reaction kettle connected with a tail gas absorption tower, the large-volume reaction kettle comprises a kettle body cast by cement and ceramic tiles lined on the inner surface of the kettle body, and the volume of the reaction kettle is more than or equal to 15m<3>. The adopted large-volume reaction kettle can improve yield, reduce production cost, and reduce environmental pollution.

Description

technical field [0001] The invention belongs to the field of organic synthesis, in particular to a production method of 2,6-dichloro-p-nitroaniline and special equipment thereof. Background technique [0002] In the prior art, the production of 2,6-dichloro-p-nitroaniline takes p-nitroaniline as a raw material, and the intermittent production of chlorine gas is introduced into a enamel single kettle. Since the current domestic largest enamel volume is 15m 3 , expensive, and because the enamel kettle shell is iron, it is easy to corrode. Therefore, the cost of equipment occupies a relatively large proportion in production, and due to the single-pot operation, not only the output is low, but also once the chlorine gas is slightly improperly introduced, the residual chlorine content in the tail gas will greatly exceed the standard, which will cause serious pollution to the environment. In addition, this method has poor selectivity and cannot effectively suppress the production...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the production of 2,6-dichloro-p-nitroaniline takes p-nitroaniline as a raw material, and the intermittent production of chlorine gas is introduced into a enamel single kettle. Since the current domestic largest enamel volume is 15m 3 , the cost is expensive, and because the shell of the enamel kettle is made of iron, it is easy to corrode

Therefore, the cost of equipment occupies a relatively large proportion in production, and due to the single-pot operation, not only the output is low, but also once the chlorine gas is slightly improperly introduced, the residual chlorine content in the tail gas will greatly exceed the standard, which will cause serious pollution to the environment.

In addition, this method has poor selectivity and cannot effectively suppress the generation of prohibited by-products polychlorinated benzidines.