Abstract: CO2 may be recovered from flue gas by a hybrid system utilizing both gas separation membranes and adsorption. Purified flue gas is separated by the gas separation membrane into permeate and non-permeate streams. The permeate stream is compressed, partially condensed at a heat exchanger, and phase-separated to produce a vent gas and high purity liquid CO2. The vent gas is recycled to the membrane. The non-permeate is fed to a PSA unit. The CO2 blow-down from the PSA unit is also compressed with the flue gas stream. The adsorbent in the PSA unit is regenerated with combustion air and the CO2-containing combustion air is fed to a combustor for combustion with fuel and an oxidant to produce the flue gas.