Mobil Oil Corporation

Gerald L Teitman

David L Johnson

Peter M Adornato

Yusuf G Adewuyi

A process for catalytically cracking a heavy feed in a single riser reactor FCC unit, with delayed riser quench and large amounts of shape selective cracking additive is disclosed. The feed is preferably quenched after at least 1 second of riser cracking. The catalyst inventory preferably contains over 3.0 wt % ZSM-5 cystal, in the form of an additive of 12-40% ZSM-5 on an amorphous support. Quenching with recycled LCO is preferred. Delayed quenching, with this catalyst system, produces unexpectedly large amounts of C3/C4 olefins, with little or no increase in coke make.

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Vienna, VA, United States of America

Gerald L Teitman