METHODS AND SYSTEMS FOR SELECTIVELY SEPARATING CO2 FROM AN OXYGEN COMBUSTION GASEOUS STREAM

摘要

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. The subject methods and systems find use in a variety of applications where it is desired to remove CO₂ selectively from an oxygen combustion flue gas stream