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Method and device for co-production of o-phenylenediamine and p-phenylenediamine

A technology for p-phenylenediamine and o-phenylenediamine, which is applied in the field of co-production of o-phenylenediamine and p-phenylenediamine, can solve problems such as potential safety hazards, and achieve the effects of large equipment operation flexibility, easy operation and stable liquid level

Active Publication Date: 2012-06-13
JIANGSU KESHENG CHEM EQUIP ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to: provide a method and device for co-producing o-phenylenediamine and p-phenylenediamine, change the rectification and separation of mixed nitro compounds into rectification and separation of mixed diamines, and solve the problem of nitro Potential safety hazards in product distillation and separation, high production efficiency, simple operation, and stable process parameters

Method used

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  • Method and device for co-production of o-phenylenediamine and p-phenylenediamine

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Embodiment 1

[0029] Embodiment 1: co-produce o-phenylenediamine and p-phenylenediamine according to the following steps:

[0030] (1) In the primary ammonolysis reactor 7 and the secondary ammonolysis reactor 8, first add water equivalent to 50% of the total volume of the reactor;

[0031] (2) Turn on the steam of the heat exchange coil and keep the reaction temperature at 100°C;

[0032] (3) At 100°C under agitation, continuously feed ammonia gas into the primary ammonolysis reactor 7 and the secondary ammonolysis reactor 8; And the pressure in the secondary ammonolysis reactor 8 remains on 3MPa;

[0033] (4) When the pressure in the kettle reaches 3MPa, continuously add water and mixed nitrochlorobenzene into the primary ammonolysis reactor 7, and the speed of adding water is based on the fact that the residence time of water passing through the primary ammonolysis reactor 7 is 15.5 , the volume ratio of mixed nitrochlorobenzene and water feed is 0.2:1;

[0034] (5) While implementi...

Embodiment 2

[0045] Embodiment 2: co-produce o-phenylenediamine and p-phenylenediamine according to the following steps:

[0046] (1) In the primary ammonolysis reactor 7 and the secondary ammonolysis reactor 8, first add water equivalent to 60% of the total volume of the reactor;

[0047] (2) Turn on the steam of the heat exchange coil of the ammonolysis reactor and keep the reaction temperature at 130°C;

[0048] (3) At 130°C under stirring, continuously feed ammonia gas into the primary ammonolysis reactor 7 and the secondary ammonolysis reactor 8; And the pressure in the secondary ammonolysis reactor 8 remains on 4MPa;

[0049] (4) When the pressure in the kettle reaches 4MPa, continuously add water and mixed nitrochlorobenzene into the first-level ammonolysis reaction kettle 7, and the speed of adding water is based on the fact that the residence time of water passing through the first-level ammonolysis reaction kettle 7 is 10 , the volume ratio of mixed nitrochlorobenzene and wat...

Embodiment 3

[0061] Embodiment 3: co-produce o-phenylenediamine and p-phenylenediamine according to the following steps:

[0062] (1) In the primary ammonolysis reactor 7 and the secondary ammonolysis reactor 8, first add water equivalent to 70% of the total volume of the reactor;

[0063] (2) Turn on the steam of the heat exchange coil of the ammonolysis reactor and keep the reaction temperature at 160°C;

[0064] (3) At 160°C under stirring, continuously feed ammonia gas into the primary ammonolysis reactor 7 and the secondary ammonolysis reactor 8; And the pressure in the secondary ammonolysis reactor 8 remains on 5MPa;

[0065] (4) When the pressure in the kettle reaches 5 MPa, continuously add water and mixed nitrochlorobenzene into the primary ammonolysis reactor 7, and the speed of adding water is based on the fact that the residence time of water passing through the primary ammonolysis reactor 7 is 15.5 , the volume ratio of mixed nitrochlorobenzene and water feed is 1:1;

[0...

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Abstract

The invention discloses a method and a device for co-production of o-phenylenediamine and p-phenylenediamine. The method for co-production of o-phenylenediamine and p-phenylenediamine is characterized in that a raw material of mixed nitrochlorobenzene obtained by chlorobenzene nitration undergoes an ammonolysis reaction to produce mixed nitroaniline; the mixed nitroaniline undergoes a hydrogenation reduction to produce mixed phenylenediamine; and the mixed phenylenediamine is subjected to rectification separation so that o-phenylenediamine and p-phenylenediamine are obtained. The method and a device for co-production of o-phenylenediamine and p-phenylenediamine have the advantages that production efficiency is high; operation is simple; technological parameters are stable; and safety hidden troubles existing in nitro-compound rectification separation are eliminated.

Description

technical field [0001] The invention relates to the field of chemical technology and chemical equipment, in particular to a method and device for co-producing o-phenylenediamine and p-phenylenediamine. Background technique [0002] O-phenylenediamine and p-phenylenediamine are important chemical intermediates, which can be used in the production of dyes, pesticides, and medicines. At present, the main process of producing o-phenylenediamine in China is to generate o-nitroaniline by ammonolysis of o-nitrochlorophenyl, and then reduce o-nitroaniline to o-phenylenediamine with alkali sulfide. The main process for producing p-phenylenediamine is to generate p-nitroaniline by ammonolysis of p-nitrochlorophenyl, and then reduce p-nitroaniline to p-phenylenediamine with alkali sulfide. O-nitrochlorobenzene and p-nitrochlorobenzene are separated by distillation from a mixture of nitrochlorobenzene. Nitrochlorobenzene is obtained by nitration of chlorobenzene. In addition to monon...

Claims

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Application Information

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IPC IPC(8): C07C211/51C07C209/36
CPCY02P20/10
Inventor 王武谦吴金华穆世彬
Owner JIANGSU KESHENG CHEM EQUIP ENG
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