偏三甲苯生产均三甲苯工艺  

TECHNOLOGY OF PRODUCTION OF 1,3,5-TRIMETHYLBENZENE FROM 1,2,4-TRIMETHYLBENZENE

作　　者：张卫江[1] 张雪梅[1] 韩振为[1] 孙兴华[1] 王凤东[1] 张军保[2] 简春贵[2] 

机构地区：[1]天津大学化工学院,天津300072 [2]天津天大天久科技股份有限公司,天津300072

出　　处：《化工学报》2002年第3期274-279,共6页CIESC Journal

摘　　要：在偏三甲苯异构化生产均三甲苯的过程中 ,虽然反应液中均三甲苯含量较高 ,但甲乙苯的累积使该过程的工业化难度大 ,生产成本高 .采用独特的异构化和烷基化反应联合工艺 ,通过烷基化有效抑制甲乙苯的累积 ,其副产品四甲苯用作异构化的原料以抑制歧化副反应 ,而异构化可弥补烷基化中均三甲苯含量低的缺陷 ,从而有效地实现均三甲苯的工业化 ,生产成本大幅度降低 .研究了工艺条件对反应的影响 ,找到了最佳的工艺条件 .目前 ,此工艺已实现了年产 6 0 0t纯度为 98.5Although the content of 1,3,5-trimethylbenzene is high in the isomerization of 1,2,4-trimethlbenzene, the process is extremely difficult to be realized industrially because of the accumulation of methylethylbenzene. A unique process using isomerization and alkylation as a union has been studied, in which alkylation is used to relieve the accumulation of metylethhylbenzene whose by-product can be used as parts of raw materials in isomerization to control the side reactions, and isomerization can raise the content of 1,3,5-trimethylbenzene. Thus 1,3,5-trimethylbenzene and the coproduct 1,2,4,5-tetramethylbezene can be produced industrially. Moreover, the production cost can be lowered greatly. Meanwhile, the effects of technological conditions on the reactions have been discussed, and the optimum technological conditions offered. The technology has been used industrially to produce 600 t/a 98.5% 1,3,5-trimethylbenzene.

关 键 词：均三甲苯 偏三甲苯 烷基化 异构化 生产工艺 

分 类 号：TQ241.1[化学工程—有机化工]