Patent ID: 8864963

Claim:
A resin-wafer electrodeionization (RW-EDI) apparatus for removing carbon dioxide from a gas stream, the apparatus comprising: a cathode; and an anode that is separated from the cathode by a plurality of porous solid basic ion exchange resin wafers, wherein the cathode, anode, and wafers are interleaved with bipolar ion exchange membranes; the plurality of wafers being arranged in a stack between the cathode and the anode; each basic wafer comprising a porous basic ion exchange medium; each basic wafer being adapted to (a) introduce a CO 2 -containing gas into an aqueous transport fluid within the basic ion exchange medium to convert CO 2 from the gas into bicarbonate ion, and (b) vent a CO 2 -depleted gas therefrom; wherein the basic wafers contain the aqueous transport fluid comprising KHCO 3 or NaH 2 PO 4 ; wherein in use, the transport fluid flows through each basic wafer and bicarbonate ion is concentrated in the transport fluid, and the basic pH of the basic ion exchange medium is maintained by application of an electric potential across the anode and cathode.