Simultaneous absorption of CO_2 and SO_2 into aqueous AMP/NH_3 solutions in binary composite absorption system

摘要

To enhance the absorption rate for CO_2, and SO_2, aqueous ammonia (NH,) solution was added to an aqueous 2-amino-2-methyl-1-propanol (AMP) solution. The simultaneous absorption rates of AMP and a blend of AMP+ NH_3 for CO_2 and SO_2 were measured by using a stirred-cell reactor at 303 K. The process operating parameters of interest in this study were the solvent and concentration, and the partial pressures of CO_2, and SO_2. As a result, the addition of NH_3 solution into aqueous AMP solution increased the reaction rate constants of CO, and SO, by 144 and 109%, respectively, compared to that of AMP solution alone. The simultaneous absorption rate of CO_2/SO_2 on the addition of 1 wt% NH_3 into 10 wt% AMP at a p_(A1) of 15 kPa and p(A2) of 1 kPa was 5.50×10~(-6) kmol m~(-2) s~(-1), with an increase of 15.5% compared to 10 wt% AMP alone. Consequently, the addition of NH_3 solution into an aqueous AMP solution would be expected to be an excellent absorbent for the simultaneous removal of CO_2/SO_2 from the composition of flue gas emitted from thermoelectric power plants.