Fluidized catalytic cracking

Details Fluidized catalytic cracking Fluidized catalytic cracking

C - Chemistry, Metallurgy

10

G

196/112

C10G 11/18 (2006.01) B01J 8/00 (2006.01)

Patent

CA 1190500

ABSTRACT OF THE DISCLOSURE The present invention relates generally to fluidized catalytic cracking. More particularly, the present invention relates to a baffle arrangement that improves separation of gaseous hydrocarbon reaction products from catalyst within the reactor vessel of a fluidized catalytic cracker unit. The catalytic reac- tor vessel includes an outer generally cylindrical shell having a stripping zone arranged at the lower end of the vessel. An inlet riser conduit forming a primary reaction zone extends generally external to and generally parallel with the shell to a location near the top of the vessel. The upper end of the riser conduit then turns through 180°, preferably through two right angle turns of 90° each, so that the riser conduit enters the vessel either on a horizontal run into the side of the vessel and then turns downwardly, or on a downward run through the top of vessel, into the center of the vessel to form an outlet, discharging downwardly the mixture of hydro- carbon and catalyst. The mixture is directed against a catalyst disengaging baffle whose surface is at an obtuse angle to the axis of the riser discharge conduit. The resulting angle of deflection of the flowing mixture is from 10° to 30°, preferably 20°. According to a prefered form of the present invention, a conical catalyst disengaging baffle is arranged with its apex directed toward and the axis concentric with and below the discharge outlet. The conical baffle is also above the stripping zone, so that the mixture is deflected outwardly from the outlet toward the wall of the vessel. Still further, in a preferred embodiment an annular catalyst disengaging wall baffle is arranged on the inside of the shell for again deflect- ing the mixture, now mostly catalyst, generally down- wardly and toward the stripping zone of the vessel. Preferably, the conical baffle and the wall baffle are arranged within the shell such that the baffles in concert with the riser discharge outlet form a partial cyclone separating zone between the baffles to thereby improve the separation of hydrocarbon vapors from the catalyst. This cyclone action promotes early disen- gagement of hydrocarbon vapor from the catalyst and reduces undesirable catalyst carryover in the vapor to conventional cyclones through which the hydrocarbon products are recovered. At the same time, stripping efficiency is also increased by quickly and effective- ly delivering spent catalyst to the stripping zone and undesirable secondary cracking reactions are minimized in the dilute phase by lowering the concentration of spent catalyst in the dilute phase.

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