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    • 9. 发明授权
    • Process for preparing p-chlorotoluene and/or m-chlorotoluene
    • 制备对氯甲苯和/或间氯甲苯的方法
    • US4650915A
    • 1987-03-17
    • US764511
    • 1985-08-09
    • Hans-Jurgen ArpeHeinz LittererNorbert Mayer
    • Hans-Jurgen ArpeHeinz LittererNorbert Mayer
    • B01J20/18B01J23/00B01J29/08B01J29/18B01J29/40B01J29/70C07B61/00C07C17/00C07C17/12C07C17/358C07C17/38C07C17/389C07C17/395C07C25/02C07C67/00
    • C07C25/02C07C17/358C07C17/389
    • The invention relates to a process for preparing p-chlorotoluene and/or m-chlorotoluene by ring-chlorination of toluene by using the following two pages (a) and (b) when further processing the toluene chlorination product composed of mixed isomers:(a) Isolation of p-chlorotoluene from a mixture of o-, m- and p-chlorotoluene by selective adsorption of p-chlorotoluene onto a mesoporous or macroporous zeolite and subsequent desorption of p-chlorotoluene(b) Treatment of an o-chlorotoluene-rich mixture of isomers with an isomerization catalyst.For the exclusive preparation of p-chlorotoluene first p-chlorotoluene is isolated and removed from the toluene chlorination product in stage (a). The remaining mixed isomers are then treated in stage (b) to increase their content of m- and p-isomers and then returned into stage (a).For the preparation of m-chlorotoluene and, if appropriate, additionally of p-chlorotoluene first the toluene chlorination product is treated in stage (b) to increase its content of m- and, if appropriate, p-isomer. p-Chlorotoluene is then isolated in stage (a) and returned to stage (b), or, if appropriate, removed. The remaining mixture essentially comprising o- and m-isomers is separated by distillation or adsorption and o-chlorotoluene is then returned into stage (b) and m-chlorotoluene is removed.
    • 本发明涉及通过使用以下两页(a)和(b)进一步处理由混合异构体组成的甲苯氯化产物时,通过甲苯的环氯化来制备对氯甲苯和/或间氯甲苯的方法:(a )通过将对氯甲苯选择性吸附到介孔或大孔沸石上并随后对对氯甲苯的解吸,从邻 - ,间 - 和对 - 氯甲苯的混合物中分离对氯甲苯(b)处理富含邻氯甲苯 异构体与异构化催化剂的混合物。 对于专门制备对氯甲苯,首先在阶段(a)中从甲苯氯化产物中分离并除去对氯甲苯。 然后在阶段(b)中处理剩余的混合异构体以增加它们的m-和p-异构体的含量,然后返回到阶段(a)。 为了制备间氯甲苯,并且如果合适,另外还加入对氯甲苯,在步骤(b)中处理甲苯氯化产物,以增加其含量,如果合适,增加对异构体。 然后在阶段(a)中分离出对 - 氯甲苯并返回到阶段(b),或者如果合适的话除去。 通过蒸馏或吸附分离基本上含有O-和m-异构体的剩余混合物,然后将邻氯甲苯回到步骤(b)中,并除去间氯甲苯。