Self-stripping fcc riser cyclone

A fluid catalytic cracking (FCC) unit, comprising:

• an FCC stripper vessel;
• a self-stripping primary cyclone disposed within the stripper vessel to separate catalyst from FCC riser effluent and form a catalyst-lean stream of hydrocarbon vapors;
• a catalyst stripping bed in a lower end of the FCC stripper;
• an inlet to the primary cyclone to supply the FCC riser effluent to the primary cyclone;
• a stripping fluid supply to the stripping bed;
• and
• a stripped catalyst outlet from the stripping bed through the lower end of the FCC stripper.

A method for stripping vapor from a suspension of particulates in a carrier gas, comprising:

• separating particulates from the suspension in an initial separation zone of a cyclone to form a particulate-rich stream with entrained vapor and a vapor stream lean in suspended matter;
• introducing a stripping fluid through openings in an exterior wall of the cyclone into a stripping zone below the initial separation zone;
• passing the particulate-rich stream from the separation zone through the stripping zone, making countercurrent contact with the stripping fluid to remove at least a portion of the entrained vapor, and into a dipleg in communication with the stripping zone;
• and
• recovering stripped particulates from the dipleg.