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均三甲苯是染料新产品活性艳兰K—3R中间体芳胺的主要原料,目前国内只能从煤焦油中少量生产,远不能满足生产的需要。根据江苏省燃化局(75)便字39号文和石油化工部(76)油化研字第645号文的精神,我们开始进行从重芳烃中制取均三甲苯的研究工作。在铂重整装置重芳烃中含有一定量的均三甲苯,但因同时含有相当量的邻一甲乙苯,由于两者沸点仅差0.437℃,难于用精馏方法获得纯度高的均三甲苯。本文以偏三甲苯为原料,采用异构化——精馏方法可以获得纯度>92％(重)的均三甲苯,所
Meta-xylene is the main raw material for the active amines K-3R aromatic amine, which is the new dye reactive product. At present, only a small amount of coal tar can be produced domestically, far from being able to meet the needs of production. In accordance with the spirit of Jiangsu Provincial Bureau of Chemical Fuel (75) Ba-39 and Ministry of Petrochemical (76) Research No. 645, we started research on the preparation of mesitylene from heavy aromatics. In a heavy reformer containing a certain amount of heavy mesitylene, but due to contain a considerable amount of o-ethylbenzene, because the two boiling point difference of only 0.437 ℃, it is difficult to use the rectification method to obtain high purity mesitylene. In this paper, partial mesitylene as raw material, the use of isomerization - distillation method can be obtained with purity> 92% (weight) of mesitylene,