Clean technology for continuously synthesizing 2,4-dinitro-6-chloroaniline

A technology of dinitroaniline and dinitro, which is applied in the field of cleaning technology for synthesizing 2,4-dinitro-6-chloroaniline, can solve problems such as unclean production and difficult treatment, achieves reduction of the amount of hydrochloric acid, avoidance of Effects of exhaust emissions, significant economic and social benefits
CN105461572AActive Publication Date: 2016-04-06ZHEJIANG LONGSHENG GROUP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG LONGSHENG GROUP
Publication Date
2016-04-06

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Abstract

A clean technology for continuously synthesizing 2,4-dinitro-6-chloroaniline adopts multistage serially connected reaction kettles and comprises the following steps: continuously adding 2,4-dinitroaniline, hydrochloric acid and chlorine to a first stage reaction kettle, carrying out a chlorination reaction under stirring, allowing parts of a material in a previous reaction kettle to enter a self reaction kettle through a pump and to circulate, allowing parts of the material in the previous reaction kettle to enter a next reaction kettle, continuously carrying out the chlorination reaction, allowing tail gas generated in the previous reaction kettle to enter the next reaction kettle, continuously carrying out the chlorination reaction, allowing parts of a material in a final stage reaction kettle to enter the self reaction kettle through a pump and to circulate, continuously discharging and filtering parts of the final obtained material after a detection result shows the reaction is completed to obtain a filter cake which is a 2,4-dinitro-6-chloroaniline product, allowing a mother liquor obtained after filtration to enter a mother liquor recovery tank, blowing air to the mother liquor in the mother liquor recovery tank, reusing hydrogen chloride tail gas obtained after blowing, pumping the blown mother liquor with certain acidity into a mother liquor storage tank, and recycling the mother liquor in the mother liquor storage tank to substitute hydrochloric acid.
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Description

(1) Technical field

[0001] The invention relates to a cleaning process for synthesizing 2,4-dinitro-6-chloroaniline, in particular to a cleaning process for continuously synthesizing 2,4-dinitro-6-chloroaniline. (2) Background technology

[0002] 2,4-Dinitro-6-chloroaniline is an important intermediate of disperse dyes, and it is widely used both at home and abroad. Its production method is generally obtained by chlorination of 2,4-dinitroaniline as raw material. Chlorinating agents mainly include: (1) sodium hypochlorite; (2) sodium chlorate; (3) chlorine gas.

[0003] (1) Use sodium hypochlorite as the chlorination agent to carry out chlorination reaction in hydrochloric acid medium. The production process of this method is more complicated, and by-products are produced in the reaction process, the product quality is poor, the color is deep, the chlorination time is long, and the equipment productivity is low , and the post-processing is more troublesome.

[0004] (2) u...

Claims

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