Fcc high efficiency partial burn regenerator

A process for combusting coke from catalyst comprising:

• contacting hydrocarbon feed with catalyst to produce cracked products and coked catalyst;
• separating said cracked products from said coked catalyst;
• delivering said coked catalyst to a lower chamber of a regeneration vessel;
• contacting coked catalyst with oxygen to combust coke from the coked catalyst;
• transporting catalyst and flue gas from the lower to an upper chamber of the regeneration vessel through a distributor into a dense catalyst bed in the upper chamber;
• contacting coked catalyst with oxygen to combust coke from the coked catalyst in the dense catalyst bed of the upper chamber;
• separating flue gas from regenerated catalyst in the upper chamber;
• discharging regenerated catalyst from said upper chamber;
• and
• discharging flue gas from said upper chamber.

A catalyst regenerator vessel for combusting coke from catalyst comprising:

• a lower chamber having a catalyst inlet for feeding spent catalyst to said lower chamber and a gas distributor for distributing combustion gas to said lower chamber;
• an upper chamber having a catalyst distributor having an inlet in the lower chamber and an outlet in the upper chamber for distributing catalyst from said lower chamber to said upper chamber, said catalyst distributor being disposed in lower third of the upper chamber;
• a separator in communication with said regenerator vessel for separating flue gas from said catalyst;
• a flue gas outlet for discharging flue gas from said vessel;
• and
• a regenerated catalyst outlet for discharging regenerated catalyst from said vessel.