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An FCC process uses a tube sheet arrangement and a multiplicity of centrifugal separation devices in an FCC reactor to reduce the volume of the reactor vessel thereby minimizing uncontrolled reaction of feed hydrocarbons and the production of riser by-products. The separation arrangement encloses an

An FCC process uses a tube sheet arrangement and a multiplicity of centrifugal separation devices in an FCC reactor to reduce the volume of the reactor vessel thereby minimizing uncontrolled reaction of feed hydrocarbons and the production of riser by-products. The separation arrangement encloses an upwardly directed outlet end of a ballistic separation device in a low volume disengaging vessel that transfers dilute catalyst and product vapors to a tube sheet arrangement of swirl tubes that removes catalyst and directs it downwardly into a stripper arrangement.

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A process for the fluidized catalytic cracking (FCC) of an FCC feedstock, said process comprising: a) passing said FCC feedstock and generated catalyst particles to a reactor riser and transporting said catalyst and feedstock upwardly through said riser thereby converting said feedstock to product v

A process for the fluidized catalytic cracking (FCC) of an FCC feedstock, said process comprising: a) passing said FCC feedstock and generated catalyst particles to a reactor riser and transporting said catalyst and feedstock upwardly through said riser thereby converting said feedstock to product vapors and producing spent catalyst particles by the deposition of coke on said regenerated catalyst particles; b) discharging a first mixture of spent particles and product vapors from a discharge end of said riser upwardly into a dilute phase of a disengaging zone at least partially contained within a reactor vessel; c) passing catalyst out of said disengaging zone to a stripping zone and contacting catalyst in said stripping zone with a stripping fluid stream; d) collecting a separated stream comprising catalyst particles having a particle size ranging from 25 to 100 m0.05 to 0.2 lbs/ft.3 and passing said separated stream to a separation chamber contained within said reaction vessel; e) dividing said separated stream in said separation chamber into a plurality of separator inlet streams and passing said separator inlet streams into a plurality of centrfugal separators each having an inlet in said chamber and a vapor outlet and a catalyst outlet communicating with the outside of said chamber; f) transporting catalyst from the catalyst outlets of said centrifugal separators into said stripping zone; and, g) collecting a vapor product stream from the vapor outlets of said centrifugal separators.