Closed cyclone FCC catalyst separation with stripping gas injection and direct steam injection

摘要

A method and apparatus for fluid catalytic cracking (FCC) in which the output of a riser conversion zone is fed to a riser cyclone separator, a primary cyclone separator, and secondary cyclone separator, connected in series within a single reactor vessel. The riser cyclone separator is connected to the primary cyclone separator by a conduit which prevents random post-riser thermal cracking of the hydrocarbons after they exit the riser cyclone. Means are also provided to blend stripping gas with the cracked hydrocarbons as they travel from the riser conversion zone to said primary cyclone separator. The stripping gas blends with the cracked hydrocarbons to improve the separation of hydrocarbons from catalyst. Steam may also be directly injected into the riser cyclone separator to aid in separation of hydrocarbons from catalyst.