CATALYTIC CRACKING PROCESS WITH RECYCLED OF OLEFIN CUT FROM THE GAS SEPARATION SECTION TO MAXIMIZE PRODUCTION OF PROPYLENE.

摘要

Producing gasoline and coproducing propylene comprises using a catalytic cracking unit having a main reactor (1) operating in upflow/downflow and treating a conventional heavy charge (CH1), and optionally a secondary riser (2) and treating a lighter charge (CH2), and further treating the main charge and optional lighter charge, where the olefin charge is withdrawn at the interstage of the humid gas compressor making part of the gas treatment section (GIS) associated with the fluid catalytic cracking (FCC) unit and constituting the stream of interstage (22). Producing gasoline and coproducing propylene comprises using a catalytic cracking unit having at least one main reactor (1) operating in upflow (riser) or downflow (Downer) and treating a conventional heavy charge (CH1), and optionally a secondary riser (2) operating under conditions more severe than the main riser (1) and treating a lighter charge (CH2), and further treating the main charge (CH1) and optional lighter charge (CH2), where the charge constituted of C4, C5 and C6 olefin molecules, the olefin charge is withdrawn at the interstage of the humid gas compressor making part of the gas treatment section (GIS) associated with the fluid catalytic cracking (FCC) unit and constituting the stream of interstage (22).