CO2 solubility in aqueous solutions of blended amines: Experimental data for mixtures with MDEA, AMP and MPA and modeling with the modified Kent-Eisenberg model

Recently, a vast quantity of new amine-based solvent systems, alternative to aqueous ethanolamine solutions, have been suggested for CO2 capture applications. In numerous cases amine blends are used, since a careful selection of the amine ratio may effectively alter the absorption capacity, the absorption kinetics and the regeneration efficiency. In this direction accurate experimental data are needed for screening applications, but most importantly for parameterizing and evaluating theoretical models used in design applications. In this work, new experimental data are presented for the CO2 solubility in aqueous solutions of amine blends containing N- methyldiethanolamine (MDEA), 2-amino-2-methyl-1-propanol (AMP) and 3-amino-1-propanol (MPA) at 298, 313, 323 and 333 K and pressures up to approximately 800 kPa. The modified Kent-Eisenberg model, param-eterized using experimental data solely for single amine solutions, is subsequently applied to predict the CO2 absorption in blended amine solutions. Satisfactory model predictions are observed. The average absolute de-viations from the experimental data of this study range between 2 and 5%.