Patent ID: 8920632

Claim:
A process for the production of gasoline and the co-production of propylene comprising cracking a principal feed that is a conventional heavy feed (CH 1 ) in a catalytic cracking unit having at least one principal reactor ( 1 ) functioning in upflow mode or downflow mode and optionally treating a lighter feed (CH 2 ) in a secondary riser ( 2 ) functioning under more severe conditions than the principal riser ( 1 ) and treating an olefinic feed constituted mainly by C4, C5 and C6 olefinic molecules in addition to principal feed (CH 1 ) and optional feed (CH 2 ), after removing said olefinic feed as inter-stage stream ( 22 ) from an inter-stage of a wet gas compressor forming part of a gas treatment section (SPG) associated with the catalytic cracking unit.