Patent ID: 9126150
Filing Date: 2015-09-08
Classification: B01D,C01B,Y02C,Y02P

Abstract:
1. 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 ion exchange resin wafers arranged in a stack between the cathode and the anode, each wafer comprising a basic portion containing a porous basic ion exchange medium and an acidic portion containing a porous acidic ion exchange medium, the basic ion exchange medium being in fluid communication with the acidic ion exchange medium of the same wafer at a gas-vented juncture defined at the interface between the basic portion and the acidic portion of the wafer; each wafer being separated from any adjacent wafer by a fluid-flow passageway in fluid communication with the basic and acidic portions of the same wafer, the passageway being defined by a spaced pair of an anion exchange membrane and a cation exchange membrane; the cathode being separated from an adjacent wafer by a cation exchange membrane, and the anode being separated from an adjacent wafer by a passageway defined by a spaced pair of an anion exchange membrane and a cation exchange membrane; the basic portion of each wafer being adapted to introduce a CO the acidic portion of each wafer being adapted to vent CO the cathode, wafers, cation exchange membranes, anion exchange membranes, and the anode together directing a net flow of protons through the wafers toward the cathode and a net flow of hydroxyl ions through the wafers toward the anode when an electric potential is applied across the cathode and anode, to thereby maintain a basic pH in the basic ion exchange medium of each wafer and an acidic pH in the acidic ion exchange medium of each wafer during capture and release of CO