Patent ID: 6723231
Filing Date: 2004-04-20
Classification: C10G

Abstract:
Process to separate propene from gaseous fluid catalytic cracking products by performing the following steps:a) separating a feed mixture comprising the gaseous products, propene and other saturated and unsaturated hydrocarbons ranging from methane to hydrocarbons having a boiling point of 250Â° C. as obtained in a fluid catalytic cracking process into a hydrocarbon-rich liquid fraction and a hydrogen containing gaseous fraction, b) separating, at a temperature between 50 and 100Â° C., the hydrogen containing gaseous fraction into a hydrogen-rich gaseous fraction and a hydrocarbon-rich gaseous fraction by membrane separation means defined by having a methane separation selectivity and a hydrogen separation selectivity, c) supplying the hydrocarbon-rich gaseous fraction obtained in step (b) to an absorber section, wherein to the top or discharge end of the absorber section a liquid hydrocarbon mixture is supplied to, which hydrocarbon mixture is poor in propene, and obtaining in said absorber section a lower boiling gaseous fraction rich in gaseous products having a boiling point of ethane or below, and d) supplying the hydrocarbon-rich liquid fraction obtained in step (a) to a stripper section and obtaining in said stripper section a gaseous fraction and a higher boiling fraction comprising propene and hydrocarbons having a boiling point higher than ethane.