Modified absorption recovery processing of FCC-produced light olefins

A process for catalytically cracking a heavy hydrocarbon feedstock and obtaining selected hydrocarbon fractions, the process comprising:

• contacting a heavy hydrocarbon feedstock with a blended cracking catalyst comprising regenerated catalyst and coked catalyst in a fluidized reactor zone at hydrocarbon cracking reaction conditions to produce a hydrocarbon effluent stream comprising a range of hydrocarbon products including light olefins, said catalyst having a catalyst composition including a first component comprising a large pore molecular sieve and a second component comprising a zeolite with no greater than medium pore size, said zeolite with no greater than medium pore size comprising at least 1.0 wt. % of the catalyst composition;
• separating the hydrocarbon effluent in a separation section to form at least one separator high pressure liquid stream and a separator high pressure vapor stream, the at least one separator high pressure liquid stream comprising C3+ hydrocarbons, the separator high pressure vapor stream comprising C3− hydrocarbons;
• contacting the separator high pressure vapor stream with a first absorption solvent in a primary absorber to form a first primary absorber process stream comprising primarily C2− hydrocarbons and residual amounts of C3+ hydrocarbons;
• contacting the first primary absorber process stream with a second absorption solvent to form a process stream comprising C2− hydrocarbon materials and a process stream comprising residual C3+ hydrocarbons and the second absorption solvent;
• bypassing the absorption zone with the at least one separator high pressure liquid stream;
• stripping C1− materials from the separator high pressure liquid stream to form a C2+ hydrocarbon process stream substantially free of C1− materials;
• separating C5+ hydrocarbon materials from the C2+ hydrocarbon process stream to form a first product process stream comprising C5+ hydrocarbon materials and a second product process stream comprising C2, C3 and C4 hydrocarbons;
• and
• introducing at least a first portion of the first product process stream to the primary absorber as a majority of the first absorption solvent.