FCC process with lift gas

摘要

A process for fluidized catalytic cracking of heavy feed using a low H2S content lift gas in the base of a riser reactor. The lift gas is a recycled, ethylene rich stream obtained by removing H2S from a compressed vapor stream intermediate the FCC main column receiver and the gas plant associated with the FCC unit. The low H2S lift gas does not increase SOx emissions from the regenerator as much as a recycled vapor from the FCC main column. As the lift gas is not purified in the gas plant it does not overload it.