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Production technology of synthesizing 6-bromo-2,4-dinitroaniline

A technology for dinitroaniline and production process, which is applied in the field of production technology for 6-bromo-2,4-dinitroaniline synthesis, can solve the problems of complex production process, low purity, low yield and the like, and achieves purity High efficiency, easy availability of raw materials, and low investment in equipment

Inactive Publication Date: 2014-05-14
ANHUI HUARUN PAINTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 6-Bromo-2,4-dinitroaniline is a yellow needle-like crystal with a density of 1.991g / cm3, a melting point of 148-153°C, a boiling point of 400.8°C, and a flash point of 196.2°C. -Bromo-2,4-dinitroaniline is an important dye intermediate with a wide range of uses, but the current industrial production of 6-bromo-2,4-dinitroaniline is still a relatively traditional way. There are problems such as low yield, low purity and serious pollution in this traditional production method, and the production process is relatively complicated, which is difficult to meet the needs of human beings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A kind of production technology of 6-bromo-2,4-dinitroaniline synthesis, comprises following processing steps,

[0017] a. Select a 3000L glass-lined reactor, and add 1500L of water, 250kg of 2,4-dinitroaniline, 100kg of hydrochloric acid and 2kg of chlorinated benzene to the inside.

[0018] b. Stir the reaction liquid in the glass-lined reactor in the above step a, control the temperature at 15° C. and add 150 kg of bromine.

[0019] c. Control the reaction temperature in the above step b at 50° C., and perform constant temperature reaction for 6.0 h.

[0020] d. After the reaction in the above step c is completed, add 33 kg of sodium hypochlorite to the reaction feed liquid and keep the temperature for 3.0 h.

[0021] e. Add 25kg of sodium sulfite to the above-mentioned reaction feed liquid to eliminate excess bromine in the reaction feed liquid, and then filter.

[0022] f. Said that the filtrate filtered in step e was washed with water, and then the product obtai...

Embodiment 2

[0024] A kind of production technology of 6-bromo-2,4-dinitroaniline synthesis, comprises following processing steps,

[0025] a. Select a 3000L glass-lined reactor, and add 1800L of water, 300kg of 2,4-dinitroaniline, 110kg of hydrochloric acid and 3kg of chlorinated benzene to the inside.

[0026] b. Stir the reaction solution in the glass-lined reactor in the above step a, control the temperature at 20° C. and add 150-200 kg of bromine.

[0027] c. Control the reaction temperature in the above step b at 52.5° C., and perform constant temperature reaction for 6.0 h.

[0028] d. After the reaction in the above step c is completed, add 33.5 kg of sodium hypochlorite to the reaction feed liquid and keep the temperature for 3.0 h.

[0029] e. Add 27.5kg of sodium sulfite to the above reaction feed liquid to eliminate excess bromine in the reaction feed liquid, and then filter.

[0030] f. Said that the filtrate filtered in step e was washed with water, and then the product obt...

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PUM

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Abstract

The invention provides a production technology of synthesizing bromethalin, and relates to the technical field of chemical engineering. The production technology comprises the following steps: reacting 2,4-dinitroaniline, water, hydrochloric acid and chlorobenzene, then respectively adding sodium hypochlorite and sodium sulfite and reacting to obtain bromethalin. The production technology has the beneficial effects that the production technology is simple, convenient, environment-friendly, pollution-free and convenient to operate, raw materials are easy to obtain, equipment investment is little, and prepared 6-bromo-2,4-dinitroaniline has high purity and good using effect and is safe and reliable.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a production process for synthesizing 6-bromo-2,4-dinitroaniline. Background technique [0002] 6-Bromo-2,4-dinitroaniline is a yellow needle-like crystal with a density of 1.991g / cm3, a melting point of 148-153°C, a boiling point of 400.8°C, and a flash point of 196.2°C. -Bromo-2,4-dinitroaniline is an important dye intermediate with a wide range of uses, but the current industrial production of 6-bromo-2,4-dinitroaniline is still a relatively traditional way. There are problems such as low yield, low purity and serious pollution in this traditional production method, and the production process is relatively complicated, which is difficult to meet the needs of human beings. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a production process for the synthesis of 6-bromo-2,4-dinitroaniline with high purity ...

Claims

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Application Information

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IPC IPC(8): C07C209/74C07C211/52
Inventor 张学永陆建新靳民张广生
Owner ANHUI HUARUN PAINTS
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