Patent ID: 8894830

Claim:
An electrochemical method comprising: contacting an anode electrolyte with an anode in an anode compartment; contacting a cathode electrolyte with a cathode in a cathode compartment wherein the cathode produces hydroxide ions; directing an industrial waste gas comprising carbon dioxide into the cathode electrolyte in the cathode compartment or directing carbon dioxide into the cathode electrolyte from a gas/liquid contactor that is in contact with an industrial waste gas; converting bicarbonate ions to carbonate ions in the cathode electrolyte and producing a pH differential between the anode electrolyte and the cathode electrolyte of between 6-12; and contacting the cathode electrolyte with a divalent cation solution to produce divalent cation carbonate and/or bicarbonate compounds, wherein the divalent carbonate and/or bicarbonate compounds comprise calcium, magnesium, or both calcium and magnesium.