Selective alkylation of xylenes with ethylene

Details Selective alkylation of xylenes with ethylene Selective alkylation of xylenes with ethylene

C - Chemistry, Metallurgy

07

C

260/685.2

C07C 15/02 (2006.01) B01J 29/40 (2006.01) C07C 2/66 (2006.01) B01J 29/65 (2006.01) B01J 29/70 (2006.01)

Patent

CA 1142552

ABSTRACT A process for the production of 3,4-dimethyl-1-ethylbenzene by selective alkylation of dimethylbenzene with ethylene. The process is carried out in the presence of a crystalline zeolite catalyst having a silica to alumina mole ratio of a least about 12 and a Constraint Index of greater than 2 and up to about 12. The selectivity with which the various isomers of the starting material are converted to the desired product can be enhanced by catalyst pretreatment such as steaming or coking. The preferred zeolite is ZSM-5. 0196

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