Xylene producing process having staged catalytic conversion of e

Details Xylene producing process having staged catalytic conversion of e Xylene producing process having staged catalytic conversion of e

1987-09-25

1988-11-08

Davis, Curtis R.

Chemistry of hydrocarbon compounds

Aromatic compound synthesis

By isomerization

585475, 585478, 585481, C07C 522

Patent

active

047835680

ABSTRACT:
A process is disclosed for the production of a desired xylene isomer, preferably paraxylene, and high quality benzene. The desired isomer (11) is recovered from the feed (1) and recycle (3) streams in a xylene separation zone (2). The raffinate (5) from the separation zone is passed into a catalytic xylene isomerization zone (6). The isomerization zone effluent stream is passed into a high severity transalkylation zone (14) which contains a catalyst comprising both a ZSM-5 zeolite and mordenite. Ethylbenzene in the feed stream is subjected to staged conversion in the two catalytic reaction zones to both xylenes and benzene. The overall ethylbenzene conversion efficiency is improved.

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