Patent ID: 8308849

Claim:
A method for removing CO 2 from a combustion gas stream, comprising: cooling the gas stream to a first temperature in the range of 0-20 degrees Celsius; cooling an ammoniated solution or slurry to a second temperature in the range of 0-20 degrees Celsius; absorbing CO 2 from the cooled gas stream using the cooled ammoniated solution or slurry to provide a CO 2 rich ammoniated solution or slurry; pressurizing the CO 2 rich ammoniated solution or slurry to a first pressure in the range of 30-2000 psi; and heating the pressurized CO 2 rich ammoniated solution or slurry to a third temperature in the range of 50-200 degrees Celsius to separate CO 2 from the pressurized ammoniated solution or slurry, wherein the first pressure and third temperature are selected to prevent ammonia from escaping the liquid phase during the separation of CO 2 from the pressurized ammoniated solution or slurry and the separated CO 2 is in a form of a pressurized gas in the range of the first pressure.