Patent ID: 8007661

Claim:
A process for catalytically cracking a heavy hydrocarbon feedstock and obtaining selected hydrocarbon fractions, the process comprising: contacting a heavy hydrocarbon feedstock with a hydrocarbon cracking catalyst in a fluidized reactor zone to produce a hydrocarbon effluent comprising a range of cracked hydrocarbon products including light olefins; separating the hydrocarbon effluent in a separation section to form at least one separator liquid stream and a separator vapor stream, the at least one separator liquid stream comprising C 3 + hydrocarbons, the separator vapor stream comprising C 3 − hydrocarbons; contacting the separator vapor stream with a first absorption solvent in an absorption zone to remove C 3 + hydrocarbons therefrom and form a process stream comprising C 2 − hydrocarbon materials; bypassing the absorption zone with the at least one separator liquid stream; stripping C 1 − materials from the at least one separator liquid stream in a stripper section to form a C 2 + hydrocarbon process stream substantially free of C 1 − materials; separating C 5 + hydrocarbon materials from the C 2 + hydrocarbon process stream to form a first product process stream comprising C 5 + hydrocarbon materials and a second product process stream comprising C 2 , C 3 and C 4 hydrocarbons; and introducing at least a first portion of the first product process stream to the absorption zone as a majority of the first absorption solvent.