Abstract
Abstract The extended UNIQUAC model as proposed by Thomsen and Rasmussen [K. Thomsen, P. Rasmussen, Chem. Eng. Sci. 54 (1999) 1787-1802] was applied to the thermodynamic representation of carbon dioxide absorption in aqueous monoethanolamine (MEA) and methyldiethanolamine (MDEA) solutions. All the essential parameters of the model are simultaneously regressed to a set of data on the MEA and MDEA systems. Freezing point depression, vapor liquid equilibrium (VLE) and excess enthalpy (HE) data of the binary systems of MEA-water and MDEA-water, VLE data on the ternary CO 2 -MEA-water as well as CO 2 -MDEA-water systems in a wide range of temperature (- 20−200 ∘ C) were used. The application of the model to a large number of experimental data for representation of total pressure over the absorbent solutions (25−200 ∘ C), correlation of the excess enthalpy and freezing point depression of the binary solutions of alkanolamine and water and also calculation of pure alkanolamine vapor pressure has been performed with good precision.
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