Process for preparing p-chlorotoluene and/or m- chlorotoluene

Details Process for preparing p-chlorotoluene and/or m- chlorotoluene Process for preparing p-chlorotoluene and/or m- chlorotoluene

C - Chemistry, Metallurgy

07

C

260/653.5

C07C 25/02 (2006.01) C07C 17/358 (2006.01) C07C 17/389 (2006.01)

Patent

CA 1224499

- 1 - Abstract of the disclosure: The invention relates to a process for preparing p-chlorotoluene and/or m-chlorotoluene by ring-chlorina- tion of toluene by using the following two stages a) and b) when further processing the toluene chlorination pro- duct composed of mixed isomers: a) Isolation of p-chlorotoluene from a mixture of o-, m- and p-chlorotoluene by selective adsorption of p-chloro- toluene onto a mesoporous or macroporous zeolite and sub- sequent 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 separa- ted by distillation or adsorption and o-chlorotoluene is - 2 - then returned into stage b) and m-chlorotoluene is removed.

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