Process for regenerating catalyst from a fluidized catalytic process

A process for regenerating catalyst from a fluidized catalytic process comprising:

• providing an oxygen stream and a preheated carbon dioxide recycle stream;
• mixing said oxygen stream and said preheated carbon dioxide recycle stream to provide a carbon dioxide rich oxidation stream;
• separating said carbon dioxide rich oxidation stream into a first portion and a second portion;
• passing the first portion of said carbon dioxide rich oxidation stream to a regenerator unit to provide a carbon dioxide rich flue gas stream;
• passing the second portion of said carbon dioxide rich oxidation stream to heat recovery section to provide a partially cooled carbon dioxide rich flue gas stream and a steam stream;
• reacting one or more of a sulfur-containing compound, a nitrogen-containing compound, or both in said partially cooled carbon dioxide rich flue gas stream with a reactant in a decontamination reactor to form a reactor effluent stream comprising reactant salt;
• filtering the reactor effluent stream to remove the reactant salt and catalyst fines to produce a filtered reactor effluent stream;
• and
• taking a carbon dioxide recycle stream from the filtered reactor effluent stream.

An apparatus for regenerating catalyst comprising:

• a heat recovery section comprising a superheated steam section and a saturated steam section;
• the superheated steam section having a flue gas inlet, a flue gas outlet, a saturated steam inlet, and a superheated steam outlet, the flue gas inlet of the superheated steam section in fluid communication with an outlet of a regenerator unit;
• and
• the saturated steam section having a flue gas inlet, a flue gas outlet, a boiler feed water inlet, and a saturated steam outlet, the flue gas inlet of the saturated steam section in fluid communication with the flue gas outlet of the superheated steam section, the saturated steam outlet of the saturated steam section in fluid communication with the saturated steam inlet of the superheated steam section;
• a decontamination reactor having a flue gas inlet, a flue gas outlet, and a reactant inlet, the flue gas inlet of the decontamination reactor in fluid communication with a flue gas outlet of the saturated steam section;
• a filter section having a flue gas inlet, a flue gas outlet, and a filter material outlet, flue gas inlet of the filter section in fluid communication with the flue gas outlet of the decontamination reactor inlet;
• a heat exchanger having a flue gas inlet and a flue gas outlet, the flue gas inlet of the heat exchanger in fluid communication with the flue gas outlet of the filter section;
• a carbon dioxide separation unit in fluid communication with the flue gas outlet of the heat exchanger;
• and
• a heater in downstream fluid communication with the carbon dioxide separation unit.