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Reaction rate constants of aqueous 2-amino-2-methyl-1-propanol (AMP)/ammonia (NH3) solutions with carbon dioxide (CO2) were determined by measuring their absorption rates. The CO2 absorption characteristics of an NH3 solution added to AMP were investigated using a stirred-cell reactor. The CO2 absorption rates into aqueous blended amine solutions were measured at different pressures (p A = 5, 10, and 15 kPa) and temperatures (293, 303, 313, and 323 K). Additive concentrations of 1, 3, and 5 wt % NH3 were added for each 30 wt % AMP solution. The results showed that the addition of NH3 to AMP significantly increased the CO2 absorption rates of AMP by 144%. In addition, the reaction rate constant for a blend of AMP and NH3 with CO2 as a function of temperature was 1.6- to 2.4-fold higher than that of AMP without NH3. The reaction rate constants were k 2,AMP = 1.543 × 107 exp(−3019.92/T) and k 2,NH3 = 1.847 × 1010 exp(−4954.25/T).

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To enhance the absorption rate for CO 2 and SO 2 , aqueous ammonia (NH 3 ) 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 2 and SO 2 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.

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