Abstract
A comprehensive thermodynamic model based on electrolyte NRTL activity coefficient model is developed for KCl+H2O binary and KCl+NaCl+H2O ternary systems. To model KCl+H2O binary systems, we identify required binary interaction parameters for (K+Cl−):H2O pair by regressing experimental thermodynamic data including mean ionic activity coefficient, osmotic coefficient, vapor pressure, enthalpy, and heat capacity. To model KCl+NaCl+H2O ternary systems, we obtain required binary interaction parameters for (Na+Cl−):H2O pair from the literature and (K+Cl−):(Na+Cl−) pair by regressing available thermodynamic data including osmotic coefficient, vapor pressure, and solubility for KCl+NaCl+H2O ternary systems. The model accurately represents all thermodynamic properties with temperature from 273.15 to 473.15K and electrolyte concentration up to saturation. This model should be useful for process modeling and simulation of aqueous electrolyte solutions involving KCl.
Published Version
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