以尿素和苯胺合成n,n′-二苯基脲的清洁方法

Cleaning method for synthesizing N,N'-diphenylurea

Abstract

The invention relates to a clean method for synthesizing N,N'-diphenyl urea through urea and aniline, in particular to a clean method for synthesizing the N,N'- diphenyl urea without catalysis through the urea and excess aniline at high temperature and normal atmosphere. Nitrogen gas is conducted to replace air in a reactor, and the conduction of the nitrogen gas is kept in the reaction process; the aniline is added to the reactor, is preheated to a temperature of between 170 and 220 DEG C, is added with the urea according to molar ratio of the urea to the aniline of between 1:4-8 and reacts for 170 to 220 DEG C under stirring; and after the reaction is finished, the unreacted aniline is separated and reclaimed through a decompression evaporation or vacuum suction filtering mode to obtain the white acicular N,N'- diphenyl urea crystal. Compared with the similar preparation method, the clean method does not add any catalyst or other solvent, has short reaction time, small material wastage, less exhausted waste, high yield of N,N'- diphenyl urea and simple reaction process.
本发明涉及以尿素和苯胺合成N,N′-二苯基脲的清洁方法,具体地说是涉及一种在常压下以尿素和过量苯胺在较高温度下非催化合成N,N′-二苯基脲的清洁方法。通氮气置换出反应器中的空气,并保持反应过程中通入氮气;将苯胺加入反应器中,预热至170~220℃后,按尿素与苯胺摩尔比为1∶4~8的比例加入尿素,在搅拌下于170~220℃进行反应;反应结束后,采用减压蒸发或真空抽滤的方式分离并回收未反应的苯胺,得到白色针状N,N′-二苯基脲晶体。本发明与同类制备方法相比,本发明不添加任何催化剂和其它溶剂,反应时间短,物料损耗小,排放废物少,N,N′-二苯基脲产率高,反应过程简单。

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Cited By (9)

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