Mobil Oil Corporation

Yusuf G Adewuyi

David L Johnson

J Scott Buchanan

Peter M Adornato

Gerald L Teitman

A process for catalytically cracking a heavy feed in an FCC unit, with large amounts of shape selective cracking additive is disclosed. The catalyst inventory preferably contains at least 10 wt % additive, of 12-40% ZSM-5 on an amorphous support, equivalent to more than 3.0 wt % ZSM-5 crystal circulating with equilibrium catalyst. Large yields of light olefins are produced, without excessive production of aromatics, or loss of gasoline yield. Operating with large amounts of additives allows yields of butadiene and/or methane to be suppressed, and production of a cracked gasoline fraction with an unusually low olefin content, and high ratio of cyclic unsaturates to normal unsaturates.

Catalyst system for maximizing light olefin yields in FCC

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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Chadds Ford, PA, United States of America

Yusuf G Adewuyi