FCC process with short primary contacting and controlled secondary contacting

A process for the fluidized catalytic cracking of a hydrocarbon containing stream, said process comprising:

• a) blending a mixture of carbonized and regenerated catalyst in a first standpipe conduit to produce a blended catalyst mixture;
• b) contacting a feedstream containing hydrocarbons with said blended catalyst mixture by dropping said catalyst mixture on a stream of said feedstream to crack hydrocarbons in said feedstream and deposit coke and hydrocarbons on the catalyst in said blended catalyst mixture wherein the stream of said feedstream carries the catalyst immediately into a disengaging vessel;
• c) disengaging cracked feedstream hydrocarbons from said blended catalyst in said disengaging vessel and withdrawing a first product stream from an upper part of said disengaging vessel;
• d) separating a first catalyst recycle stream from said first product stream and returning said first catalyst recycle stream to said disengaging vessel;
• e) withdrawing a portion of the catalyst from said disengaging vessel into a contacting conduit and effecting further catalytic cracking of the hydrocarbons deposited on the catalyst in order to produce a second product stream and spent catalyst;
• f) stripping hydrocarbons from said spent catalyst in a stripping zone;
• g) recovering said second product stream;
• and,
• h) passing a portion of said spent catalyst to regeneration zone to provide said regenerated catalyst.