Riser cracking for maximum C3 and C4 olefin yields

Details Riser cracking for maximum C3 and C4 olefin yields Riser cracking for maximum C3 and C4 olefin yields

1992-05-04

1995-02-14

Myers, Helane

Mineral oils: processes and products

Chemical conversion of hydrocarbons

Cracking

208113, 208 48Q, C10G 1302

Patent

active

053892321

ABSTRACT:
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.

REFERENCES:
patent: 3758403 (1973-09-01), Rosinski et al.
patent: 4764268 (1988-08-01), Lane
patent: 4818372 (1989-04-01), Mauleon et al.
patent: 5019239 (1991-05-01), Owen
patent: 5043058 (1991-08-01), Forgac et al.
patent: 5087349 (1992-02-01), Goelzer et al.

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