Patent ID: 7795486

Claim:
An integrated process for catalytically cracking a heavy hydrocarbon feedstock, obtaining a combined propane/propylene stream, and reacting the propylene of the combined propane/propylene stream with benzene to produce a cumene product stream, the integrated process comprising: contacting a heavy hydrocarbon feedstock with a hydrocarbon cracking catalyst in a fluidized reactor zone to produce a hydrocarbon effluent stream comprising propane and propylene; separating the hydrocarbon effluent stream in a separation zone into a separator liquid stream and a separator vapor stream; stripping C 2 − hydrocarbon materials from the separator liquid stream in a stripper column to form a C 3 + hydrocarbon process stream substantially free of C 2 − hydrocarbons; separating C 4 + hydrocarbons and impurities from the C 3 + hydrocarbon process stream to provide a combined propane/propylene stream; pumping the combined propane/propylene stream as a liquid at a pressure ranging from about 2900 kPa to about 4000 kPa to an alkylation zone to an alkylation zone; reacting at least some of the propylene of the combined propane/propylene stream with benzene in the alkylation zone to produce cumene; and heating the stripper column with at least one heat exchanger driven by heat generated in an alkylation reactor of the alkylation zone.