Absorption of CO2 in a sterically hindered amine: modeling absorption in a mechanically agitated contactor

Abstract

Abstract The absorption of dilute CO 2 into aqueous solutions of a sterically hindered amine, 2-amino-2-methyl-1-propanol (AMP), is modeled in the mechanically agitated contactor under the fast pseudo first-order reaction condition using the kinetic data for CO 2 –AMP presented elsewhere by this study group [A.K. Saha, S.S. Bandyopadhyay, A.K. Biswas, Kinetics of absorption of CO 2 into aqueous solutions of 2-amino-2-methyl-1-propanol, Chem. Eng. Sci. 50 (1995) 3587–3598.] Experimental results of absorption studies in the mechanically agitated contactor at 288 and 301.5 K over ranges of CO 2 partial pressure (5–15 kPa) and amine concentration (1–2 kmol m −3 ) are in excellent agreement with the results predicted from the numerical model, confirming the validity of the mathematical model proposed, and the kinetic data and the mechanism presented earlier by this study group for the CO 2 –AMP system [A.K. Saha, S.S. Bandyopadhyay, A.K. Biswas, Kinetics of absorption of CO 2 into aqueous solutions of 2-amino-2-methyl-1-propanol, Chem. Eng. Sci. 50 (1995) 3587–3598.] The maximum deviation between the predicted and experimental values of liquid-phase CO 2 loading with time was within 3%.