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A method for preparing 3-chloro-4-methylaniline

A technology of methylaniline and p-nitrotoluene, which is applied in the field of preparation of 3-chloro-4-methylaniline, can solve problems such as complex processes and increased energy consumption, and achieve the goal of saving raw materials and reducing energy loss Effect

Inactive Publication Date: 2012-10-03
WUJIANG TUNCUN PIGMENT PLANT
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of 3-chloro-4-nitrotoluene by this method will consume more p-nitrotoluene, and the complicated process increases the consumption of energy

Method used

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  • A method for preparing 3-chloro-4-methylaniline
  • A method for preparing 3-chloro-4-methylaniline

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Embodiment Construction

[0014] The present invention is described in detail below in conjunction with accompanying drawing and specific embodiment:

[0015] figure 1 A preparation method of 3-chloro-4-methylaniline is shown, the method comprises the following steps: passing 0.48-0.54 parts by weight of p-nitrotoluene under the condition of stirring process temperature (70°C-80°C) Chlorine is chlorinated in the chlorine tank, and after stirring for 10 minutes, put the material in the chlorine tank into the washing tank for washing; transfer the washed material to the rectification tank for refining, and then enter the reduction tank with a catalyst. A tower, introducing 0.038-0.044 parts by weight of hydrogen into the reduction tower for reduction; transferring the reduced material to a rectification kettle for further refining to obtain the product. The preparation method of 3-chloro-4-methylaniline provided by the invention effectively saves the use of raw materials and reasonably reduces energy c...

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Abstract

The invention discloses a method for preparing 3-chloro-4-methylaniline. The method comprises the following steps: 0.48-0.54 weight parts of chlorine is pumped into paranitrotoluene for chlorination in a chlorine kettle under the condition of stirring temperature and stirred for 10 minutes, then materials in the chlorine kettle are washed in a washing kettle; the washed materials are transferred into a refining kettle to refine, then the refined materials are transferred into a reduction tower with a catalyst, and 0.038-0.044 weight parts of hydrogen is pumped into the reduction tower for reduction; and the reduced materials are transferred into the the refining kettle to repurify to obtain the final product. The method for preparing 3-chloro-4-methylaniline provided by the invention saves the usage of raw materials effectively and reduces energy consumption rationally.

Description

technical field [0001] The invention relates to a preparation method of a pigment intermediate, in particular to a preparation method of 3-chloro-4-methylaniline. Background technique [0002] The current production of 3-chloro-4-methylaniline is generally obtained by chlorination and reduction of p-nitrotoluene. The preparation method is simple. The general preparation method is: 1. Chlorination: add nitrotoluene to the reaction pot, heat To 75°C, put in anhydrous ferric chloride and iodine, stir for 10-20min, then start chlorine flow at 60°C, keep the chlorination temperature at 55-70°C, until the melting point of chloride > 58.5°C does not increase within 20min . Catch the air, raise the temperature to 80-90°C, and keep it for 1.5-2h to get 2-chloro-4-nitrotoluene with a yield of 98%. 2. Reduction: Add the prepared sodium sulfide solution into the reaction pot, add the above-mentioned 2-chloro-4-nitrotoluene at 70-80°C, reflux for 4 hours, the temperature is 110±5°C,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C211/52C07C209/36
Inventor 梅跃新田亚东
Owner WUJIANG TUNCUN PIGMENT PLANT
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