Measurement of vapour-liquid equilibrium and e-NRTL model development of CO2 absorption in aqueous dipropylenetriamine.
Environmental science and pollution research international April 1, 2021 Neha Kumari Agarwal, Bikash Kumar Mondal, Amar Nath Samanta 8 citations
Aqueous dipropylenetriamine (DPTA) captures carbon dioxide more effectively than conventional solvents such as monoethanolamine, 2-amino-2-methyl-1-propanol, and N-methyldiethanolamine, as well as newer polyamine solvents like aminoethylethanolamine, piperazine, and hexamethylenediamine. Vapour-liquid equilibrium data for CO₂ in DPTA solutions were measured at temperatures from 313 to 333 K and pressures from 1 to 100 kPa, with DPTA concentrations of 5 to 15 mass%. The electrolyte non-random two-liquid (e-NRTL) model, fitted using Aspen Plus data regression, predicted the experimental data with an average absolute deviation of 22.3%. The model also estimated solvent capacity, liquid-phase speciation, and heat of CO₂ absorption.