Abstract: There is provided an apparatus which separates and strips catalyst particles suspended in gaseous hydrocarbons after the suspension of gaseous hydrocarbons and catalyst particles have traversed a gas/solids conduit means. A substantially can-shaped open-ended cyclone is placed in a disengager shell such that an inlet of the open-ended cyclone is in communication with the gas/solids conduit means. The disengager shell has a zone for containing a fluidized catalyst and the open end of the open-ended cyclone projects into the zone. A hollow closed cyclone may be placed in communication with the open-ended cyclone via an exhaust conduit means.