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

The carbon dioxide (CO 2 ) 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 CO 2 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 CO 2 in aqueous DEEA solutions. Meanwhile, the speciation of the solution at different loadings was also predicted using the developed eNRTL model.