Kinetics of CO 2 Absorption by a Blended Aqueous Amine Solution

Abstract

The reaction rates of CO 2 in an aqueous blend of amine solutions of N-(2-hydroxethyl)piperazine (N-HEPZ) and 2-amino-2-hydroxymethyl-1,3-propanediol (AHPD) at 298K were investigated in a concentration range of 0.0025-0.03kmolm -3 N-HEPZ with a blend of 1kmolm -3 AHPD. The reaction was modeled using a termolecular reaction mechanism with a rate of 12971m 3kmol -1s -1. The results indicate that the blended aqueous solution of N-HEPZ and AHPD is a potential candidate as an alternative solvent for CO 2 absorption, where the sterically hindered AHPD increases the CO 2 capacity and the reaction rate is enhanced by the promoter, N-HEPZ. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.