Clean technology for continuously synthesizing 2,6-dichloro-p-nitroaniline

A technology for the synthesis of p-nitroaniline, applied in the preparation of organic compounds, preparation of amino compounds, organic chemistry, etc., to achieve significant economic and social benefits, reduce the amount of hydrochloric acid, and achieve effective treatment and comprehensive utilization of resources
CN105461571AActive 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 2,6-dichloro-p-nitroaniline 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 2,6-dichloro-p-nitroaniline 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 2,6-dichloro-p-nitroaniline, in particular to a cleaning process for continuously synthesizing 2,6-dichloro-p-nitroaniline. (2) Background technology

[0002] 2,6-Dichloro-p-nitroaniline is an important dye intermediate, which is used for the synthesis of disperse dyes such as disperse yellow brown 3GL, decomposed yellow brown 2RFL, disperse brown 3R, and disperse brown 5R. The synthesis methods are mainly as follows :

[0003] (1) direct chlorination method

[0004]

[0005] P-nitroaniline is obtained by reacting with chlorine gas at 35°C under the condition of hydrochloric acid. Although the method is cheap and easy to obtain raw materials, the yield is 95%, and the purity is more than 98%, but the hydrogen chloride tail gas needs to be recovered and treated.

[0006] (2) Sodium chlorate method

[0007]

[0008] p-Nitroaniline is obtained by reacting with sodium chlorate at 20...

Claims

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