Method for producing p-p-phenylene diamine by p-nitroaniline hydrogenation

A technology for p-nitroaniline and p-phenylenediamine, which is applied in chemical instruments and methods, preparation of amino compounds, preparation of organic compounds, etc., can solve the problems of high environmental harm, high cost of sewage treatment, large sewage and sludge, etc.

Inactive Publication Date: 2005-03-16
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These two methods all produce a large amount of sewage and sludge, serious environmental pollution, and the cost of sewage treatment

Method used

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Examples

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Embodiment

[0008] Add 138 grams of p-nitroaniline, 1 gram of self-made catalyst, and 300 ml of solvent in a one-liter autoclave. After sealing the autoclave, replace the air with hydrogen, then heat and stir, and the temperature is controlled at 100 ° C. The internal hydrogen pressure is controlled at 5MPa. After 4 hours of reaction, the hydrogen pressure will no longer decrease. Stop stirring, pass cooling water to cool down, and after the temperature drops to 20-30°C, release the gas in the kettle, drop to normal pressure, and then open the reaction kettle. Filter the obtained solid-liquid mixture with a funnel to separate the solid, evaporate the solvent from the filtrate, combine the solids to obtain p-phenylenediamine crystals, the content of p-phenylenediamine reaches 99.7% through analysis, and the yield is 98%. No waste water is discharged during the synthesis process.

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PUM

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Abstract

The invention provides a novel process for synthesizing p-phenylene diamine which comprises, using a catalyst and a solvent, producing p-p-phenylene diamine by p-nitroaniline hydrogenation, disintegrating catalyst after end of reaction, and obtaining p-phenylene through disintegrating solvent from the solution by crystallization or distillation.

Description

technical field [0001] The invention belongs to the field of fine chemicals and relates to a method for producing p-phenylenediamine by hydrogenating p-nitroaniline. The International Patent Classification belongs to C07B 43 / 04. Background technique [0002] p-Phenylenediamine is an important organic chemical raw material, which is generally used in the production of dyes, rubber antioxidants, etc. There are two traditional production methods, one is the iron powder reduction method, which uses iron powder and hydrochloric acid to reduce p-phenylenediamine Aniline; Another method is alkali sulfide reduction method, which uses alkali sulfide to reduce p-nitroaniline. These two methods all produce a large amount of sewage and sludge, serious environmental pollution, and the cost of sewage treatment is very high, and the product yield is low, generally about 80%, so this production method has high cost and is harmful to the environment. [0003] The purpose of the present inv...

Claims

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Application Information

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IPC IPC(8): C07C209/36C07C211/51
Inventor 王延臻张苗苗
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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