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Production process for synthesizing 3,5-dibromonitrobenzene

A production process, the technology of bromonitrobenzene, is applied in the production process field of 3,5-dibromonitrobenzene synthesis, which can solve the problems of high density, low yield and low purity, and achieve convenient and simple preparation and low equipment investment. less, better effect

Inactive Publication Date: 2014-06-18
ANHUI HUARUN PAINTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to dissolve in water, and its density is higher than that of water; it is easily soluble in ethanol, ether, benzene and oil. It is the chemical raw material of traditional Chinese medicine for synthetic dyes and organic synthesis intermediates. Compared with the traditional method, 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

[0022] A kind of production technology that 3,5-dibromonitrobenzene is synthesized, comprises following process step,

[0023] (1) Bromination

[0024] a. Select a 1000mL round bottom flask, and then add 13.5g of p-nitroaniline, 90mL of water and 20mL of concentrated hydrochloric acid.

[0025] b. Shake the mixture in the round bottom flask in step a to obtain the p-nitroaniline solution, add 290 mL of water and then immerse the flask in cold water to cool.

[0026] c. A stopper of a long airway and a short airway is arranged at the bottleneck of the flask, and the two airway are connected to a safety bottle and a bromine generator respectively.

[0027] d. Put 18mL of liquid bromine into the bromine generator in step c, and then immerse the bromine generator in a water bath at 35°C.

[0028] e. Connect the safety bottle in step b to the water pump, turn on the water pump to keep the air bubbles in the safety bottle at a rate of 1-2 per second, a yellow precipitate is produc...

Embodiment 2

[0037] A kind of production technique of 3,5-dibromonitrobenzene synthesis, it is characterized in that: comprise following processing steps,

[0038] (1) Bromination

[0039] a. Select a 1000mL round bottom flask, and then add 13.8g of p-nitroaniline, 100mL of water and 25mL of concentrated hydrochloric acid.

[0040] b. Shake the mixture in the round bottom flask in step a to obtain the p-nitroaniline solution, add 300 mL of water and then immerse the flask in cold water to cool.

[0041] c. A stopper of a long airway and a short airway is arranged at the bottleneck of the flask, and the two airway are connected to a safety bottle and a bromine generator respectively.

[0042] d. Put 19 mL of liquid bromine into the bromine generator in step c, and then immerse the bromine generator in a water bath at 40°C.

[0043] e. Connect the safety bottle in step b to the water pump, turn on the water pump to keep the air bubbles in the safety bottle at a rate of 1-2 per second, a ye...

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PUM

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Abstract

The invention discloses a production process for synthesizing 3,5-Dibromonitrobenzene, relating to the technical field of chemical engineering. The production process comprises the steps of performing bromination reaction to obtain crude 2,6-dibromo-4-nitrobenzene; then, preparing nitride precipitates from crude 2,6-dibromo-4-nitrobenzene which is taken as a raw material, alcohol and benzene, and carrying out elimination reaction. The production process disclosed by the invention has the beneficial effects that the preparation is convenient, simple, environment-friendly and pollution-free, materials are easily available, the equipment investment is a little, the purity is high, the production process is convenient to operate, and prepared 3,5-dibromonitrobenzene is good in use 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 3,5-dibromonitrobenzene. Background technique [0002] 3,5-Dibromonitrobenzene is a colorless or light yellow oily liquid with a bitter almond smell. It is difficult to dissolve in water, and its density is higher than that of water; it is easily soluble in ethanol, ether, benzene and oil. It is the chemical raw material of traditional Chinese medicine for synthetic dyes and organic synthesis intermediates. Compared with the traditional method, 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 3,5-dibromonitrobenzene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C205/12C07C201/12
Inventor 张学永陆建新靳民张广生
Owner ANHUI HUARUN PAINTS
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