Absorption of CO2 into novel aqueous bis(3-aminopropyl)amine and enhancement of CO2 absorption into its blends with N-methyldiethanolamine

A study towards the kinetics of carbon dioxide (CO2) absorption into a novel aqueous solution of bis(3-aminopropyle)amine (APA) was carried out at 303, 308, 313 and 3231( over a concentration range of 0.1-0.5 kmol m(-3) and different CO2 partial pressure. The reaction mechanism of CO2 with primary and secondary amines (zwitterionic mechanism) is described and based on this, experimentally obtained kinetic data are interpreted. A qualitative nuclear magnetic resonance [NMR (1D and 2D)] spectroscopy method has been applied to develop the reaction scheme for novel aqueous APA with CO2, The kinetic rate parameters were investigated according to the pseudo-first-order condition. The values of second-order rate constant, k(2-APA) and reaction rate with CO2 reported in this study were higher than piperazine (PZ), 2-(1-piperazinl)-ethylamine (PZEA), etc. Furthermore, enhancement factor increases significantly in comparison to aqueous MDEA solutions when the APA concentrations in the blends with MDEA varied from 0 to 0.5 kmol m(-3). (C) 2017 Elsevier Ltd. All rights reserved.