Patent ID: 6110356
Filing Date: 2000-08-29
Classification: C10G

Abstract:
A process for the production and separation of a fluidized catalytic cracking (FCC) product stream wherein the product stream contains fine catalyst particle, the process comprising:a) passing an FCC feedstock and regenerated catalyst particles to a reaction zone to convert said feedstock;b) separating catalyst particles from gaseous hydrocarbons and recovering an FCC product stream containing fine catalyst particles and passing separated particles to a relatively dense bed;c) passing the FCC product stream to a fractionation zone and to separating the FCC product stream in the fractionation zone into at least a relatively light hydrocarbon stream and a relatively heavy hydrocarbon stream;d) recovering a particle recycle stream containing fine catalyst particles and at least a portion of the relatively heavy hydrocarbon stream;e) concentrating particles in the particle recycle stream to provide a concentrated particle stream having a higher concentration of particles than the particle recycle stream;f) injecting the concentrated particle stream directly into the relatively dense bed at an injection point;g) withdrawing a coked catalyst stream comprising at least a portion of the fine particles from the relatively dense bed at a location below the injection point and passing the coked catalyst stream to a regeneration zone; and,h) combusting coke from catalyst particles in the regeneration zone to generate flue gas that passes out of the regeneration zone carrying entrained fine catalyst particles therewith to supply regenerated catalyst to the reaction zone.