OXY-COMBUSTION CO2 CAPTURE-Chilled Ammonia Process (CAP)
Environmentally benign in terms of emissions, CAP is a chemical absorption process using an ammonium-based aqueous solvent. The flue gas is contacted with chemical solvent—forming ammonium bicarbonate, ammonium carbonate, and ammonium carbamate. The chemical reactions are reversible, and raising the temperature and the pressure of the reaction products reverses the capture reactions, releasing CO2 and allowing the solvent to be regenerated and returned to the process.
CAP technology can be applied to various types of power plants such as coal, gas and biomass, as well as a vast range of industrial processes emitting CO2. The technology uses ammonia for the solvent, which is a globally available, low-cost commodity chemical with excellent thermal and chemical properties