Abstract: Methods are provided for the selective multi-stage removal of CO2 from an oxygen combustion flue gas stream to provide a CO2 depleted gaseous stream. In practicing the subject methods, an initial flue gas stream is contacted with an aqueous fluid under conditions of CO2 hydrate formation to produce a CO2 hydrate slurry and CO2 depleted gaseous stream. A feature of the subject methods is that the CO2 hydrate slurry is separated from the CO2 depleted gaseous stream and then compressed to high pressure to produce a high-pressure CO2 product. A further feature is that the CO2-depleted gaseous stream is sent to at least one additional hydrate reactor for further removal of CO2. Also provided are systems that find use in practicing the subject methods.

Abstract: Methods are provided for the selective removal of CO2 from a multicomponent gaseous stream to provide a CO2 depleted gaseous stream. In practicing the subject methods, an initial multicomponent gaseous stream is contacted with an aqueous fluid under conditions of selective CO2 clathrate formation to produce a CO2 clathrate slurry and CO2 depleted gaseous stream. A feature of the subject methods is that the CO2 clathrate slurry is then compressed to high pressure to produce a high-pressure CO2 product. Also provided are systems that find use in practicing the subject methods. The subject methods and systems find use in a variety of applications where it is desired to selectively remove CO2 from a multicomponent gaseous stream.