Production method of double-kettle-switching continuous chlorination

Abstract

The invention relates to the technical field of chemical production, in particular to a production method of double-kettle-switching continuous chlorination. According to the invention, two reaction kettles are connected in series, and the double reaction kettles are alternately switched to serve as a main reaction kettle and an auxiliary reaction kettle for a chlorination reaction; after a solution in the kettle serving as the main reaction kettle is sampled and detected to meet requirements, the reaction of the main reaction kettle is finished, introduction of chlorine into the main reaction kettle and the auxiliary reaction kettle is stopped, the main reaction kettle enters a discharging procedure, and the auxiliary reaction kettle is allowed to enter a heat preservation state; as materials are further fed into the main reaction kettle, chlorine is continuously introduced into the main reaction kettle for a reaction, and the main reaction kettle and the auxiliary reaction kettle are switched when the main reaction kettle does not contain or contains a small amount of o-chlorotoluene; and the original auxiliary reaction kettle serves as the main reaction kettle for a reaction, introduction of chlorine is stopped and the reaction is stopped until the solution in the original auxiliary reaction kettle is sampled and detected to be qualified, then cooling and discharging are conducted, and the original main reaction kettle is used as the auxiliary reaction kettle to maintain a reaction temperature in the kettle. According to the invention, the continuous production of the chlorination reaction can be realized, a chlorine content in tail gas is reduced, and the raw material entrainment in the tail gas is reduced.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a production method for continuous chlorination with double-tank switching. Background technique [0002] O-chlorobenzonitrile, also known as o-chlorobenzonitrile, is an important intermediate for fine chemicals and organic preparation. Using o-chlorobenzonitrile as raw material, the corresponding o-chlorobenzylamine, o-chloroaniline, o-fluorobenzonitrile, o-fluorobenzoic acid, o-fluoroaniline, etc. can be prepared, which are widely used in dyestuff, medicine, pesticide and spice industries. O-chlorobenzonitrile is also an important intermediate for the preparation of new anti-malarial drug nitroquine and various anti-inflammatory and bactericidal drugs, and for the preparation of non-peptide anti-angiotensin. [0003] At present, there are multiple synthesis methods of o-chlorobenzonitrile, one of which uses o-chlorotoluene as a raw material, and reacts with chlorin...

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to aim at the deficiencies of the prior art, and provide a kind of production method of continuous chlorination with double-tank switching, which solves the problem of discontinuous production, low efficiency, large tail gas pollution, and raw materials entrained in the tail gas in the existing production process. Too many, leading to problems such as low product yield

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