Process for preparing 2, 4-dinitro-6-chloroaniline by sulfuric acid method

Abstract

The invention discloses a process for preparing 2, 4-dinitro-6-chloroaniline by using a sulfuric acid method, which comprises the following steps: carrying out processing reaction on reaction raw materials by using a stirring device, discharging after the reaction is finished, and carrying out suction filtration; the stirring step comprises the following steps: A, putting reaction raw materials and sulfuric acid into a stirring barrel; b, starting a motor and driving a stirring rotating shaft to rotate, and driving a stirring plate to rotate by the stirring rotating shaft to stir the raw materials; c, chlorine is introduced into the raw materials in the stirring barrel through a ventilation structure before the raw materials are stirred; d, the stirring rotating shaft drives a control structure to move, and then the control structure drives a stirring plate to change the angle through a stirring adjusting structure; e, adjusting the angle of the stirring plate according to the rotating speed of the stirring rotating shaft through a speed adapting structure; and by arranging the ventilation structure, chlorine can be better ensured to be introduced into the solution, the solution is ensured not to flow back, and the mixing uniformity of the chlorine and the solution is better ensured.

Description

technical field [0001] The invention belongs to the technical field of chemical reaction preparation, in particular to a process for preparing 2,4-dinitro-6-chloroaniline by a sulfuric acid method. Background technique [0002] Existing 2,4-dinitro-6-chloroaniline needs to pass chlorine into the reactant to carry out chlorination during preparation, but can not pass chlorine in the reaction solution, can only pass chlorine outside the solution, to The surface of the solution is chlorinated, resulting in a slow chlorination rate and an uneven degree of chlorination, which will ultimately affect the quality of the reaction product. If chlorine gas is introduced into the interior, it will cause the backflow of the solution because the gas pressure stopped by the chlorine gas cannot be stably controlled. affect the stability of use. SUMMARY OF THE INVENTION [0003] In order to overcome the deficiencies of the prior art, the present invention provides a process for preparing ...

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Problems solved by technology

[0002] Existing 2,4-dinitro-6-chloroaniline needs to pass into chlorine gas to reactant inside and carry out chlorination during preparation, but can't pass into chlorine gas inside reaction solution, can only pass into chlorine gas outside the solution, to The surface of the solution is chlorinated, which leads to slow chlorination and uneven chlorination, which will eventually affect the quality of the reaction product. If chlorine gas is introduced inside, the solution will reflux because the pressure of chlorine gas cannot be stably controlled. Affect the stability of use

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