Continuous nitration reaction device for pendimethalin technical

Abstract

The invention provides a continuous nitration reaction device for pendimethalin technical. The device comprises a hydrochloric acid separator, a dilute nitric acid discharge pipe, an alkali washing tank, an alkali water control valve, an alkali water tank, an alkali washing separator, an alkali water discharge pipe, a water washing tank, a softened water control valve, a softened water tank and an evaporation separator, wherein an outlet in the lower right side of the hydrochloric acid separator is in threaded connection with the dilute nitric acid discharge pipe; and an outlet in the middle of the right part of the hydrochloric acid separator is connected with a left inlet of the alkali washing tank through a pipeline. The arrangement of a material hopper A, a dilute nitric acid storage hopper, a material hopper B1, a material control valve, a salifying tank, a cushion storage tank, an extraction separator, a salifying separator, an extraction tank, a material hopper B2 and an acidic water discharge pipe is matched with the arrangement of a nitrate box, a nitrate control valve, a nitration tank, a neutralization tank, a mechanical valve, a softening water storage tank and an acidic water storage tank; so the combination of salification and nitration processes in the nitration reaction process is facilitated, and continuous production is realized.

Description

technical field [0001] The invention belongs to the technical field of nitration reaction equipment, in particular to a continuous nitration reaction device for pendimethalin original medicine. Background technique [0002] The nitration reaction is a reaction to introduce nitro groups into aromatic rings, and the reaction product nitro compounds are extremely versatile. The production of nitro compounds is to carry out nitration reaction in the nitration reactor first, and then separate the crude nitrates containing nitrophenols and other by-products from the nitration waste acid, and the crude nitrates are washed with water and alkali to obtain nitration products. The nitrification reaction can be divided into intermittent nitrification or continuous nitrification according to whether the production process is continuous, and can be divided into thermal nitrification and adiabatic nitrification according to whether the heat of nitrification reaction is taken out during the...

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Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the present invention provides pendimethalin technical continuous nitration reaction device, to solve the problem that the existing reaction device still has multiple material transfers, which is easy to cause high labor intensity, serious waste of raw materials, salt formation, nitration dropwise addition, etc. Responding to potential safety hazards and low production efficiency

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