Patent ID: 7087154

Claim:
An apparatus for fluid catalytic cracking of a hydrocarbon feed oil containing liquid hydrocarbons boiling between 340° C. to 720° C., wherein said apparatus comprises: e) a regenerated catalyst riser carrying a diluted phase regenerated catalyst up to a regenerated catalyst distributor; f) a regenerated catalyst distributor provided with a distributing basket and an independent passage through pipes for the carrying fluid used to carry catalyst in said regenerated catalyst riser, said catalyst distributor being connected to said riser by a crossover section and to a downflow reactor by means of a catalyst acceleration zone followed by a mixing zone, said distributor centrifuging carrying fluid and catalyst and distributing catalyst to said downflow reactor; g) a downflow reactor, having in the upper part of same a mixing zone to start the catalytic cracking reaction, wherein said mixing zone is provided with feed injectors to vaporize the feed which will contact the regenerated catalyst in said mixing zone, the bottom part of said reactor being connected to diplegless cyclones by means of a rectangular cross-section pipe; and h) a collector vessel provided with a quick separation device to swiftly separate spent catalyst from reacted hydrocarbon gases.