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Novel continuous production method of phenylenediamine

A production method and technology of phenylenediamine, applied in chemical instruments and methods, preparation of organic compounds, preparation of nitro compounds, etc., can solve the problems of high energy consumption, cumbersome process, damaged yield, etc., and achieve reduction of reaction steps , Simplify production procedures and reduce production costs

Active Publication Date: 2020-10-30
杨美玲
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Not only the process is cumbersome, but also the energy consumption is high and the yield is impaired

Method used

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  • Novel continuous production method of phenylenediamine
  • Novel continuous production method of phenylenediamine
  • Novel continuous production method of phenylenediamine

Examples

Experimental program
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Embodiment 1

[0063] Prepare mixed acid according to the volume ratio of concentrated nitric acid and concentrated sulfuric acid as 1.2:1, then the mixed acid and chlorobenzene are continuously entered into 1# nitration pot according to the molar ratio of chlorobenzene and nitric acid as 1:1.05, and nitrated at 50-55°C for 40 minutes, and react The material overflows to 2# nitration pot, and continues to react at 60-65°C for 40 minutes, then enters 3# nitration pot, and reacts at 70-75°C for 40 minutes. After the reaction is completed, the material is discharged, neutralized and washed with water to obtain mixed nitrochlorobenzene;

[0064] Mix nitrochlorobenzene directly with ammonia water for ammonolysis, the mass ratio of mixed nitrochlorobenzene and 35% ammonia water is 1:3.5, heat up to 180°C, keep the reaction for 10 hours under 45kg atmospheric pressure (about 45MPa), and then cool down The material was filtered and washed with ice water to obtain mixed nitroanilines.

[0065] The m...

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Abstract

The invention relates to a novel continuous production method of phenylenediamine. The method comprises the steps of nitrification, ammonolysis, reduction, rectification and the like. According to themethod, the reaction steps are reduced, and the intermediate refining process is omitted, so that the production procedure is simplified, the production cost is reduced, the working efficiency is greatly improved, the loss is reduced, the rectification requirement is reduced, the product is easier to separate, the energy consumption is reduced, and finally, the high-purity phenylenediamine product is obtained at high yield.

Description

technical field [0001] The invention relates to a production method of phenylenediamine, in particular to a novel continuous production method of phenylenediamine, which belongs to the field of fine chemicals. Background technique [0002] Aromatic diamines, especially 1,4-phenylenediamine (p-Phenylenediamine) and 1,2-phenylenediamine (o-Phenylenediamine), are widely used intermediates body. P-phenylenediamine (its melting point is about 140°C, such as in the range of 138-147°C, boiling point of about 267°C) can be used to prepare azo dyes, high molecular polymers, and can also be used to produce fur dyes, rubber antioxidants and Photo developer. P-phenylenediamine is an extremely important dye intermediate, mainly used in aramid fiber, azo dyes, sulfur dyes, acid dyes. o-Phenylenediamine (which has a melting point of about 103°C, such as in the range of 102-104°C, and a boiling point in the range of 252-258°C, such as about 256-258°C). O-phenylenediamine is an intermedi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/10C07C209/36C07C209/86C07C211/51C07C211/52C07C201/08C07C205/12
CPCC07C201/08C07C209/10C07C209/325C07C209/86C07C205/12C07C211/52C07C211/51Y02P20/584Y02P20/10
Inventor 李根荣徐新连
Owner 杨美玲
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