Kinetics of CO2 absorption by aqueous mixtures of N,N′‐diethylethanolamine and polyamines

Abstract

AbstractAqueous solutions of N,Nʹ‐diethylethanolamine (DEEA) are prospective high‐capacity CO2‐capturing solvents. Their reactivity can be enhanced by promotion with absorption activators. Two polyamines were chosen as activators in this work, viz. (methylamino)propylamine (MAPA) and diethylene triamine (DETA). In a stirred cell reactor, kinetics of CO2 absorption into aqueous DEEA/MAPA and DEEA/DETA mixtures was studied at 303 K. The molarity of DEEA was varied in the 2–2.5 M range, whereas the polyamine concentration was changed between 0.1 and 0.5 M. Pseudo–first‐order rate constants were reported. Second‐order rate constants for the CO2 reactions with MAPA and DETA were determined too. DETA reacts faster than MAPA.