Patent ID: 7973209
Filing Date: 2011-07-05
Classification: B01D,C07C,C10G

Abstract:
1. A process for catalytically cracking a heavy hydrocarbon feedstock and obtaining light olefins substantially free of carbon dioxide, 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 hydrocarbon products, including light olefins, and a quantity of carbon dioxide; separating the hydrocarbon effluent in a hydrocarbon separation section comprising a compression section to form at least one separator liquid stream and a separator vapor stream, the at least one separator liquid stream comprising C treating the separator vapor stream in an amine treatment section with an amine absorption solvent at treatment conditions effective to absorb a significant portion of the carbon dioxide from the separator vapor stream and to form a treated stream comprising C recycling said first process stream to said hydrocarbon separation section for further processing; and fractionating at least a portion of the treated stream comprising C