The dry carbonate process: Carbon dioxide recovery from power plant flue gas
Nelson, T. O., Coleman, L. J., Green, D. A., & Gupta, R. P. (2009). The dry carbonate process: Carbon dioxide recovery from power plant flue gas. In Proceedings of the 9th International Conference on Greenhouse Gas Control Technologies (GHGT-9), 16-20 November 2008, Washington DC, , pp. 1305–1311. .
RTI’s Dry Carbonate Process, a solid sorbent CO2 capture approach, has been developed as a retrofit technology for existing power plants. The process is based on the reversible reaction between sodium carbonate, CO2, and water vapor to form sodium bicarbonate. Concentrated CO2 is recovered by a thermal-swing process. Field testing of a prototype Dry Carbonate Process has been completed with a total of 235 h of operation using natural gas- and coal-derived flue gases. The Dry Carbonate demonstrated >90% CO2 capture and minimal adverse effects of exposure to SO2. Current R&D efforts are focussing on improving the process configuration and sorbent material to scale-up the process to a pilot unit capable of capturing 1 ton of CO2 per day.