System and process for steam cracking and PFO treatment integrating selective hydrogenation and FCC

A process for treatment of PFO from a steam cracking zone that produces light olefins and PFO from one or more steam cracking feeds, the process comprising:

• optionally separating the PFO into at least a first stream containing C9+ aromatics compounds with one benzene ring, and a second stream containing C10+ aromatic compounds;
• selectively hydrogenating all or a portion of the PFO, or all or a portion of the second stream containing C10+ aromatics compounds, using catalysts and conditions, including hydrogen, effective for conversion of polyaromatics compounds contained in the PFO into aromatic compounds with one benzene ring to produce selectively hydrogenated effluents;
• reacting all or a portion of the selectively hydrogenated effluents and optionally all or a portion of the first stream containing C9+ aromatics compounds with one benzene ring, by fluid catalytic cracking using catalysts and conditions effective for ring opening and dealkylation to produce fluid catalytic cracking reaction products including light cycle oil;
• separating at least a portion of the light cycle oil into BTX compounds.