Thermodynamic properties and CO2 solubility of monoethanolamine plus diethylenetriamine/aminoethylethanolamine mixtures: Experimental measurements and thermodynamic modeling

The densities, viscosities, and refractive indices of monoethanolamine + diethylenetriamine/aminoethylethanolamine binary liquid mixtures were measured at atmospheric pressure and temperatures of 298.15, 303.15 and 308.15 K across the complete composition range. From the experimental data, several thermodynamic properties - including the excess volume, partial molar volume, partial molar volume at infinite dilution, excess Gibbs free energy of flow activation and excess refractive index - were calculated. Excess molar volume and excess refractive index data were correlated to the Redlich-Kister equation, and these properties were used to analyze molecular interactions in the binary mixtures. These volumetric properties were then predicted using the associating version of the PC-SAFT equation of state to test its applicability for amine systems, for which PC-SAFT showed promising results. Finally, viscosities were correlated using various models, including Arrhenius-like and McAllister. (C) 2017 Elsevier B.V. All rights reserved.