Vapor liquid equilibria and heat of absorption of CO2 in aqueous 2-(diethylamino)-ethanol solutions

The carbon dioxide (CO2) solubility in aqueous 2-(diethylamino)-ethanol (DEEA) solutions were measured at (60 and 80 °C), with the DEEA concentrations of 3 M and 4 M and pressure range of (3 to 192 kPa). The absorption heat of CO2 with (1, 3, and 4 M) aqueous DEEA solutions at different temperatures is also presented in this work. A thermodynamic model based on the electrolyte non-random two-liquid (eNRTL) theory within Aspen Plus® has been developed to correlate and predict the vapor liquid equilibrium and heat of absorption of CO2 in aqueous DEEA solutions. Meanwhile, the speciation of the solution at different loadings was also predicted using the developed eNRTL model.