Oxygen fired FCC regenerator with CO2 capture

A method for operating a regenerator for a fluid catalytic cracking reaction system, comprising:

• exposing a hydrocarbonaceous feed to a catalyst in a reactor under fluid catalytic cracking conditions to form one or more gasoline products and coke associated with the catalyst;
• passing at least a portion of the catalyst and the associated coke into a regenerator;
• passing a gas comprising CO2 and O2 to the regenerator, wherein the CO2 content in the gas is greater than 50% by vol %;
• combusting at least a portion of the associated coke with at least a portion of the O2 to form at least heated catalyst and flue gas;
• passing the flue gas to a CO boiler;
• subsequent to the flue gas exiting the CO boiler, passing the flue gas to a wet gas scrubber to substantially remove SOx and to form a reduced particulate flue gas having less than 20 mg per normal cubic meter of particulate;
• passing a first portion of the reduced particulate flue gas to a recycle loop that includes a knock out drum and feeds into the CO boiler;
• passing a second portion of the reduced particulate flue gas to a wet electrostatic precipitator to form a low particulate flue gas;
• passing a first portion of the low particulate flue gas to a CO2 capture system;
• passing a second portion of the low particulate flue gas to the regenerator as a recycled CO2 content;
• and
• passing at least a portion of the heated catalyst into the reactor.

A method for operating a regenerator for a fluid catalytic cracking reaction system, comprising:

• exposing a hydrocarbonaceous feed to a catalyst in a reactor under fluid catalytic cracking conditions to form one or more liquid products and coke associated with the catalyst;
• passing at least a portion of the catalyst and the associated coke into a regenerator;
• passing a combustion gas comprising CO2 and O2 to the regenerator, wherein the CO2 content in the combustion gas is greater than 50% by vol % and a nitrogen content is less than 20%;
• combusting at least a portion of the associated coke with the combustion gas to form at least heated catalyst and flue gas;
• passing the flue gas to a wet gas scrubber to form a reduced particulate flue gas;
• passing a scrubbing liquid used in the wet gas scrubber through a cooler;
• passing the reduced particulate flue gas to a wet electrostatic precipitator to form a low particulate flue gas having less than 20 mg per normal cubic meter of particulate;
• passing a first portion of the low particulate flue gas to a CO2 capture system;
• passing a second portion of the low particulate flue gas to the regenerator as a second recycled CO2 content;
• passing a third portion of the low particulate flue gas into a CO boiler;
• and
• passing at least a portion of the heated catalyst into the reactor.