Abstract: There is a method has the steps of (A) scrubbing the gas in a scrubber with a first alkaline, aqueous scrubbing liquid to provide a first spent aqueous scrubbing liquid; (B) feeding the first spent aqueous scrubbing liquid to an electrolytic cell having an anode chamber and a cathode chamber; (C) regenerating the first spent aqueous scrubbing liquid by electrolysis; and (D) withdrawing regenerated alkaline, aqueous scrubbing liquid from the cathode chamber and recirculating it to the scrubber. The method has a step of separating a liquid carbon dioxide from gaseous oxygen in a gas separator into (i) a first stream having carbon dioxide, and (ii) a secondary stream having oxygen containing less than 30% carbon dioxide. The secondary stream is introduced into at least a portion of the first spent aqueous scrubbing liquid prior to feeding the first spent aqueous scrubbing liquid into the anode chamber.

Abstract: There is a method for preparing a substantially pure gaseous carbon dioxide from a gaseous mixture of carbon dioxide (CO2) and oxygen (O2). The gaseous mixture is withdrawn from an anode chamber of an electrolytic cell. The electrolytic cell is fed a spent aqueous scrubbing liquid from a scrubber. The scrubber scrubs a gas [having a first carbon dioxide concentration] with a first alkaline, aqueous scrubbing liquid. The spent aqueous scrubbing liquid is regenerated in the electrolytic cell by electrolysis. Regeneration further has the step of generating a gaseous mixture of oxygen and carbon dioxide in the anode chamber The gaseous mixture has between 66 and 80% carbon dioxide and between 20% and 34% oxygen. The method has the step of treating said gaseous mixture of oxygen and carbon dioxide to remove at least 50% oxygen from said mixture.

Abstract: A method of scrubbing a gas, such as flue gas or exhaust gas, comprising carbon dioxide to deplete the gas of carbon dioxide (CO2), the method comprising the steps of: scrubbing the gas in a scrubber (210) with a first alkaline, aqueous scrubbing liquid to dissolve carbon dioxide (CO2) as hydrogen carbonate (HCO3?) and/or as carbonate (CO32?) in the first alkaline, aqueous scrubbing liquid, thereby providing a first spent aqueous scrubbing liquid comprising hydrogen carbonate (HCO3?) and/or carbonate (CO32?), the first spent aqueous scrubbing liquid having a pH from about 7 to about 9; feeding the first spent aqueous scrubbing liquid to an anode chamber of an electrolytic cell (310) comprising the anode chamber (313) and a cathode chamber (312) separated by a membrane (311); regenerating the first spent aqueous scrubbing liquid in the electrolytic cell (310) by electrolysis, the electrolysis increasing the pH of the first spent aqueous scrubbing liquid in the cathode chamber (312), the electrolysis further