Preparation method of 2,4-binitro-6-chloroaniline

Abstract

The invention relates to the chemical industry field, in particular relates to a preparation method of 2,4-binitro-6-chloroaniline. The preparation method of the 2,4-binitro-6-chloroaniline is carried out under heat insulation condition by adopting a pipeline reactor, the process from contact of the materials to reaction is finished instantly without producing polychlorinated compounds and chlorine dioxide, the potential safety hazard is avoided, the product quality and yield are greatly improved, the HPLC (high performance liquid chromatography) purity is not less than 98%, and the 2,4-dinitraniline residue is not more than 1%; the final product does not come into contact with oxidized sodium chlorate and chlorine due to adoption of the pipeline continuous reaction, no oxidation product is produced in the system, the product quality is improved, and the infinite recycling of the master liquid can be realized; the mother liquid is filtered through a film to recycle sodium chloride, and the infinite recycling of the mother liquid is realized after the mother liquid adsorbs hydrogen chloride, and the sodium chlorate approaches to a theoretical consumption.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a preparation method of 2,4-dinitro-6-chloroaniline. Background technique [0002] The existing technology is to add 2.4-dinitroaniline, hydrochloric acid, water in the reactor, and drop sodium chlorate under the liquid, and the reaction equation is: [0003] [0004] Its disadvantages are: [0005] 1. The local reaction temperature is high, it is difficult to control, and it is easy to produce polychlorinated compounds; [0006] 2. Because the chlorine gas and sodium chlorate have many contact opportunities, the chlorine dioxide produced is easy to explode, and there are serious safety hazards; [0007] 3. The quality of the product is poor, the HPLC purity is 94-95%, and the residue of 2,4-dinitroaniline is about 4%; [0008] 4. The energy consumption is high, and a large amount of circulating water is required to control the temperature; [0009] 5. The reaction concent...

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Problems solved by technology

[0005] 1. The local reaction temperature is high, it is difficult to control, and it is easy to produce polychlorinated compounds;

[0006] 2. Since the generated chlorine gas and sodium chlorate have many contact opportunities, the generated chlorine dioxide is easy to explode, and there are serious safety hazards;

[0007] 3. The quality of the product is poor, the HPLC purity is 94-95%, and the residue of 2,4-dinitroaniline is about 4%;

[0008] 4. The energy consumption is high, and a large amount of circulating water is required to control the temperature;

[0010] 6. Too much sodium chlorate produces a lot of waste gas

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