Process and apparatus for regenerating catalyst from a methanol to olefins process

A process for regenerating catalyst from an MTO 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;
• filtering the partially cooled carbon dioxide rich flue gas stream to remove the catalyst fines to produce a filtered flue gas stream;
• and
• taking a carbon dioxide recycle stream from said filtered flue gas 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 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 saturated steam section of the heat recovery section;
• 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;
• and
• a carbon dioxide separation unit in fluid communication with the flue gas outlet of the heat exchanger, said carbon dioxide separation unit is in thermal communication with the flue gas outlet of the filter section via a carbon dioxide recycle stream in said heat exchanger.