CO₂ Capture by Cold Membrane Operation with Actual Power Plant Flue Gas

Closing the Anthropogenic Chemical Carbon Cycle toward a Sustainable Future via CO2 Valorization

“…The excellent modularity and scalability of the polymeric membrane endows it great potential to retrofit existing plants, and the practical application of polymeric membranes toward CO 2 separation has already been demonstrated at the National Carbon Capture Center in Alabama at a 20 ton day −1 scale. [82] Nevertheless, application of polymeric membranes in capturing dilute CO 2 from flue gas is hampered by the unsatisfactory CO 2 separation efficiency due to the Robeson's upper-bound limit (permeability must be sacrificed for selectivity and vice versa). [83] Additionally, poor chemical and thermal resistance as well as their tendency to swell under long-term operation also limit the widespread application of polymeric membranes.…”

Recent Progress in the Engineering of Polymeric Membranes for CO2 Capture from Flue Gas

“…However, the rest of the HRSG exhaust is cooled to −35 °C through a heavily heat-integrated cryogenic heat exchanger, which is then passed to a three-stage membrane process for CO 2 capture and selective EGR. For certain polyimide membranes, it is known that the CO 2 /N 2 selectivity increases without a huge reduction on the CO 2 permeance when operated at a sub-ambient temperature [ 50 , 51 ]. Therefore, a CO 2 /N 2 selectivity as high as 100 can be expected.…”