Abstract: A method of removing carbon dioxide from flue gas is disclosed. The method comprises mixing the flue gas with ammonia; and contacting the gas mixture with calcium nitrate solution to produce calcium carbonate precipitates and ammonium nitrate solution; or contacting the gas mixture with sodium nitrate solution to produce sodium carbonate precipitates and ammonium nitrate solution. The carbonate/bicarbonate precipitates are recovered by separating the carbonate/bicarbonates (s) from said solutions. An apparatus for performing the above method is also disclosed. The apparatus comprises a reaction vessel with an inlet to receive said solution and an inlet to receive and deliver a flue gas-ammonia mixture to a gas-liquid contactor which is configured to diffuse said gas mixture into either calcium nitrate or sodium nitrate solution.

Abstract: A method of removing carbon dioxide from flue gas is disclosed. The method comprises mixing the flue gas with ammonia; and contacting the gas mixture with calcium nitrate solution to produce calcium carbonate precipitates and ammonium nitrate solution; or contacting the gas mixture with sodium nitrate solution to produce sodium carbonate precipitates and ammonium nitrate solution. The carbonate/bicarbonate precipitates are recovered by separating the carbonate/bicarbonates (s) from said solutions. An apparatus for performing the above method is also disclosed. The apparatus comprises a reaction vessel with an inlet to receive said solution and an inlet to receive and deliver a flue gas-ammonia mixture to a gas-liquid contactor which is configured to diffuse said gas mixture into either calcium nitrate or sodium nitrate solution.

Abstract: A method and apparatus for removing carbon dioxide from a flue gas is disclosed. The method comprises contacting the flue gas with an ammoniated solution to produce an ammonium bicarbonate solution and contacting the ammonium bicarbonate solution with a sulphate source to produce a carbonate compound and an ammonium sulphate solution. The apparatus comprises a gas-liquid absorption zone configured for contacting the flue gas with an ammoniated solution to produce an ammonium bicarbonate solution; the gas-liquid absorption zone having respective inlets to receive the flue gas and the ammoniated solution in the gas-liquid absorption zone, and an outlet for egress of the ammonium bicarbonate solution.