PROCESS AND APPARATUS FOR IMPROVING LIGHT OLEFIN YIELD FROM A FLUID CATALYTIC CRACKING PROCESS

摘要

The present invention discloses a process optimizing the yield of ethylene and propylene from a fluid catalytic cracking unit. The method combines a first catalytic reactor, a fractionation zone, a separation unit and a second catalytic reactor. The separation unit produces a first separate stream comprising C4 olefins and a second separate stream comprising C5 olefins. The separate streams may be combined and are passed to a second catalytic reactor for additional conversion to ethylene and propylene.

主权项

1. A process for catalytic cracking, the process comprising:
(a) feeding a hydrocarbon feed stream to a first catalytic reactor; (b) passing an effluent stream of the first catalytic reactor to a fractionation section to produce a first fractionation stream, the first fractionation stream comprising C4 hydrocarbons; (c) passing the first fractionation stream to a separation unit to produce a first separated stream having a greater concentration of C4 olefins than the first fractionation stream; and (d) feeding the first separated stream to a second catalytic reactor.