Improved Process for the Preparation of 4-Sulfamoylaniline

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Abstract

The synthetic technology of 4-sulfamoylaniline with acetyl aniline via chloro-sulfonation, amination and hydrolysis process was improved. The hydrogen chloride gas generated in the chloro-sulfonation process was absorbed into 30% hydrochloric acid and the hydrochloric acid could be sold as by-product to make profits; one part of the spent acid generated in the chloro-sulfonation process was used to adjust the pH of reaction mixture after the hydrolysis process, the other was used for the acidification process of dihydroxynaphthalene in our company; the 4-sulfamoylaniline solution was concentrated to increase the product yield, and the final 4-sulfamoylaniline mother liquor was used for the decomposition reaction of chloro-sulfonation products; most of the inorganic salts generated in the concentration process of 4-sulfamoylaniline mother liquid was sodium chloride, which could be used as frozen brine;the condensate water generated in the concentration of 4-sulfamoylaniline mother liquid was used to wash ASC. After the improvement of synthetic technology, the yield of 4-sulfamoylaniline was increased from 69.0% (for industry) to 72.5%, the cost was decreased correspondingly and the less waste was discharged.

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	Articles by authors
	Zhang Tianyong
	Deng Yongfeng
	Li Bin
	Yang Yang
	Yuan Zhongfei

Keywords： 4-sulfamoylaniline； sulfa； chloro-sulfonation； hydrochloric acid； concentration

Received 2014-05-06;

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Cite this article:

Zhang Tianyong, Deng Yongfeng, Li Bin, Yang Yang, Yuan Zhongfei.Improved Process for the Preparation of 4-Sulfamoylaniline[J] Chemcial Industry and Engineering, 2016,V33(4): 18-22

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