- Number 327 |
- December 20, 2010
NETL Patents Novel CO2 Separation Concept
Researchers at the National Energy Technology Laboratory have received a U.S. patent for a novel process to separate CO2 from flue gas. The process couples kinetic rate enhancements of amine-based scrubbing with phase separation of CO2 and chemical regeneration of the amine solution. The CO2 is absorbed into an amine-bearing solution containing dissolved sodium or potassium carbonate. The dissolved CO2 reacts with the carbonate to form the corresponding bicarbonate, which precipitates from solution in a semi-crystalline form. The separated bicarbonate solid is then heated to release CO2 and regenerate the carbonate reagent, thus avoiding the energy penalty associated with heating of the bulk amine solution. In an alternative configuration of this novel process, the CO2-loaded amine solutions are used to promote rapid carbonation of solid streams with significant carbonation potential (e.g., waste cement, CaO-bearing fly ash, and other industrial by-product streams). Through this carbonation, CO2 is sequestered as a stable mineral carbonate and the CO2 capture capacity of the amine solution is chemically regenerated. A patent was issued November 30, 2010 (U.S. patent 7,842,126).
[Linda Morton, 304.285.4543,