Altaf F Husain, 7219724 Crystal Hills Dr, Northridge, CA 91326

5475175, Dec 12, 1995

Apr 18, 1994

8/228780

Altaf Husain - Danbury CT
Albin Huss - Chadds Ford PA
Iraj I. Rahmim - Voorhees NJ

Mobil Oil Corporation - Fairfax VA

C07C 256

585332

This invention provides a process for upgrading hydrocarbon feedstock comprising the steps of: (i) recovering a C. sub. 4 -rich aliphatic stream from a catalytic cracking process; (ii contacting said C. sub. 4 -rich aliphatic stream with an isomerization catalyst comprising a zeolite sorbing 30 to 55 mg n-hexane at 90. degree. C. , 83 torr, and 15 to 40 mg 3-methylpentane at 90. degree. C. , 90 torr, per g dry zeolite in the hydrogen form in a first reaction stage to selectively isomerize C. sub. 4 n-olefins to C. sub. 4 isoolefins; and (iii) contacting the product stream from said first reaction stage with a solid acid alkylation catalyst selected from the group consisting of MCM-36 and MCM-49, as described herein and zeolites having a Constraint Index of less than or equal to about 2, to produce isoparaffinic alkylate gasoline.