Patent ID: 8753577

Claim:
An integrated system for cracking a heavy hydrocarbon feedstock to produce an effluent comprising a range of hydrocarbon products including C 5 olefins and for cracking C 5 olefin hydrocarbon products to produce C 2 and C 3 olefins, said integrated system comprising: a fluidized catalytic cracking reactor wherein the heavy hydrocarbon feedstock contacts a hydrocarbon cracking catalyst at hydrocarbon cracking reaction conditions to produce a hydrocarbon effluent comprising a range of hydrocarbon products including C 5 olefins; a separator to separate the hydrocarbon effluent to form a wet gas stream comprising C 5 and lighter hydrocarbons; a first compressor to compress the wet gas stream; a gas concentration system wherein the compressed wet gas stream is processed to at least separately concentrate and remove C 2 paraffinic hydrocarbon products, concentrate and recover C 3 and C 4 hydrocarbon products and separate C 5 olefin hydrocarbon products; an olefin cracking reactor wherein at least a portion of the C 5 olefin hydrocarbon products are cracked to form a cracked olefin effluent comprising C 2 -C 4 hydrocarbons including C 2 and C 3 olefins; a first return line wherein at least a portion of the cracked olefin effluent is introduced into the first compressor and subsequently processed through the gas concentration system; and a cracked olefin effluent separation system effective to separate the cracked olefin effluent into a vapor stream comprising C 2 and C 3 olefins, a liquid stream comprising C 4 hydrocarbons and a third stream comprising C 5 hydrocarbons.