Patent ID: 7666364

Claim:
An apparatus for fluidized catalytic cracking of hydrocarbon feed comprising: (a.) a reactor vessel; (b.) an elongated reactor having an inlet section comprising an inlet for said hydrocarbon feed and an inlet for a source of hot regenerated catalytic cracking catalyst and an outlet section having an outlet discharging catalytically cracked products and spent catalyst into said reactor vessel; (c.) a closed cyclone separation means within said reactor vessel receiving cracked products and spent catalyst discharged from said elongated reactor and separating them into a catalyst rich phase which is discharged down into a catalyst stripper within said reactor vessel and a cracked product phase with a reduced content of catalyst which is discharged from said closed cyclone via a cyclone vapor outlet; (d.) a spent catalyst stripper means in a lower portion of said reactor vessel, receiving spent catalyst discharged from said closed cyclone, having a stripping gas inlet in a lower portion of said catalyst stripper, a stripper vapor outlet in an upper portion of said stripper means which is in open fluid communication with said reactor vessel and a stripped catalyst outlet in a lower portion of said stripper; (g.) a stripper vapor transfer conduit having an inlet in a lower portion thereof in open fluid communication with said reactor vessel at an elevation below said closed cyclone and above said catalyst stripper vapor outlet, and an outlet in an upper portion of said transfer conduit fluidly connected with said closed cyclone separator or a line fluidly connective with said cyclone vapor outlet; (h.) a catalyst regenerator means receiving stripped catalyst discharged from said catalyst stripper having an inlet for an oxygen-containing regeneration gas, an outlet for flue gas produced during catalyst regeneration and an outlet for regenerated catalyst connective with said inlet portion of said elongated reactor, (i.) wherein said cyclone separation means comprises at least one primary cyclone connected to said reactor discharging solids down into said stripper via a catalyst standpipe and said stripper vapor transfer conduit is at least partially contained within said catalyst standpipe and said transfer conduit outlet is within said primary cyclone.