Mobil Oil Corporation

Conroy D Anderson

Paul H Schipper

Francis G Dwyer

Klaus W Schatz

Frederick J Krambeck

Tai-Sheng Chou

William A Stover

William E Cormier, Jr

Gary M Pasquale

Paul W Snyder, Jr

Modified ZSM-5 type zeolite catalyst is prepared by controlled aging in a moving bed catalytic cracking unit. The modified catalyst exhibits significant olefin isomerization activity and reduced paraffin cracking activity. Hydrocarbons are cracked to products boiling in the motor fuel range, e.g., gasoline, by using the modified catalyst mixture comprising a ZSM-5 type zeolite and a conventional cracking catalyst. The ZSM-5 type zeolite is treated with partial pressure steam under conditions which increase the gasoline octane number of the product fuel without decreasing gasoline plus distillate yield. A process for changing a catalytic cracking unit's inventory from a conventional catalyst to a modified ZSM-5 type containing catalyst is also disclosed.

Octane improvement of gasoline in catalytic cracking without decreasing

Catalyst and hydrocarbon vapors are separated in a cyclone attached to the discharge of a riser cracking operation. The cyclone is modified to include a separate cyclonic stripping of catalyst separated from hydrocarbon vapors.

Method and means for separating gasiform materials from finely divided

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Wenonah, NJ, United States of America

Conroy D Anderson