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Preparation method, production equipment and use method of 2, 4, 6-trichloroaniline

A technology of trichloroaniline and production equipment, which is applied in the field of preparation of 2,4,6-trichloroaniline, can solve the problems of high enterprise cost and low effective conversion rate, and achieve enterprise cost saving, low consumption, and improved product synthesis rate effect

Inactive Publication Date: 2021-09-24
翱华工程技术股份有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] At present, there are mainly two methods for the synthesis of 2,4,6-trichloroaniline, one is the synthesis of hydrogen chloride and aniline in an acidic environment, the effective conversion rate of this method is low, only 90%; the other is the synthesis of liquid chlorine Synthesized with aniline (with chlorobenzene as the carrier) in the acidic environment of the catalyst, the effective conversion rate of this method is about 93%, and it is accompanied by a large amount of hydrogen chloride gas, and the enterprise cost is relatively high

Method used

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  • Preparation method, production equipment and use method of 2, 4, 6-trichloroaniline
  • Preparation method, production equipment and use method of 2, 4, 6-trichloroaniline

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preparation example Construction

[0044] The preparation method of 2,4,6-trichloroaniline disclosed by the invention comprises the following steps:

[0045] Put chlorobenzene and aniline into the reaction kettle for synthesis, then pass into hydrogen chloride gas, and finally pass into chlorine gas;

[0046] After passing the chlorine gas, keep warm until the reaction is complete, filter to obtain the filter cake and filtrate, press filter the filter cake and dry to obtain 2,4,6-trichloroaniline; the filtrate is chlorobenzene;

[0047] Add the hydrogen chloride gas produced in the reaction kettle for synthesis and the chlorobenzene obtained by filtering into the reaction kettle for acidification, use the hydrogen chloride gas to acidify the chlorobenzene, and then add the acidified chlorobenzene into the reaction kettle for synthesis React provides a reactive environment.

[0048] The invention reuses the tail gas (hydrogen chloride gas) produced by the synthesis reaction, which can provide a better acidic en...

Embodiment 1

[0051] In this embodiment, the original single reactor is designed into a two-stage closed environment, and the tail gas generated by the first-stage reactor is recycled to improve the reaction efficiency and the product synthesis rate.

[0052] Specific as figure 1 As shown, the production equipment of 2,4,6-trichloroaniline disclosed in this embodiment includes a primary enamel reactor 11 and a secondary enamel reactor 12, the primary enamel reactor 11 is used for synthesis reaction, and the secondary enamel reactor 11 is used for synthesis reaction. Reactor 12 is used for acidification.

[0053]The secondary enamel reaction kettle 12 is located above the primary enamel reaction kettle 11 . The product outlet at the bottom of the secondary enamel reactor 12 is connected to the primary enamel reactor 11 through a valve and a liquid pipeline 5 .

[0054] The gas outlet of the primary enamel reaction kettle 11 is connected with the secondary enamel reaction kettle 12 through ...

Embodiment 2

[0065] In this embodiment, the original single reactor is designed into a three-level closed environment, and the tail gas generated by the first-level reactor is recycled to improve the reaction efficiency and the product synthesis rate.

[0066] like figure 2 As shown, the production equipment of 2,4,6-trichloroaniline disclosed in this embodiment includes a primary enamel reactor 11, a secondary enamel reactor 12 and a tertiary enamel reactor 13, and the primary enamel reactor 11 is used as For the synthesis reaction, the secondary enamel reactor 12 is used for primary acidification, and the tertiary enamel reactor 13 is used for secondary acidification.

[0067] The third-level enamel reaction kettle 13 is located above the first-level enamel reaction kettle 11 , and the second-level enamel reaction kettle 12 is located above the third-level enamel reaction kettle 13 .

[0068] The product outlet at the bottom of the secondary enamel reaction kettle 12 is connected to th...

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Abstract

The invention relates to a preparation method of 2, 4, 6-trichloroaniline, which comprises the following steps: adding chlorobenzene and aniline into a reaction kettle for synthesis, then introducing hydrogen chloride gas, and finally introducing chlorine gas; after the chlorine is introduced, keeping the temperature until the reaction is complete, filtering to obtain a filter cake and filtrate, carrying out filter pressing on the filter cake, and drying to obtain 2, 4, 6-trichloroaniline, wherein the filtrate is chlorobenzene; and adding hydrogen chloride gas generated in the reaction kettle for synthesis and the filtered chlorobenzene into a reaction kettle for acidification, acidifying the chlorobenzene by using the hydrogen chloride gas, and then adding the acidified chlorobenzene into the reaction kettle for synthesis to provide a reaction environment for the synthesis reaction. The tail gas (hydrogen chloride gas) generated by the synthesis reaction is reused, a better acid environment can be provided for the synthesis reaction, the reaction efficiency can be improved, the product synthesis rate can be improved, the tail gas emission can be reduced, and the enterprise cost can be saved.

Description

technical field [0001] The invention relates to the technical field of organic chemical synthesis, in particular to a preparation method, production equipment and use method of 2,4,6-trichloroaniline. Background technique [0002] At present, there are mainly two methods for the synthesis of 2,4,6-trichloroaniline, one is the synthesis of hydrogen chloride and aniline in an acidic environment, the effective conversion rate of this method is low, only 90%; the other is the synthesis of liquid chlorine Synthesize with aniline (with chlorobenzene as the carrier) in the acidic environment of the catalyst. The effective conversion rate of this method is about 93%, and it is accompanied by a large amount of hydrogen chloride gas, and the enterprise cost is relatively high. Contents of the invention [0003] In order to solve the above technical problems, the present application provides a preparation method, production equipment and use method of 2,4,6-trichloroaniline. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C209/74C07C211/52
CPCC07C209/74C07C211/52
Inventor 孙元培张建国宋皓王震宇郝瑞宇段丽红贾敏王敏
Owner 翱华工程技术股份有限公司
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