Liquid-Liquid equilibrium is thermophysical properties necessary for designing liquid-liquid extraction processes [1]. Calculation of liquid-liquid equilibrium has been widely made using activity coefficient models like NRTL equation [2]. As the group contribution method, ASOG-LLE parameters [3] have been used for predicting ternary liquid-liquid equilibrium.
This paper deals with the measurement of solubilities and tie lines for ethanol + water + solvent (amyl alcohol, butanol, heptane) systems at 298.15 K and 303.15 K, and solubilities for ethanol + water + solvent (butyl phthalate, benzyl acetate, oleic acid, hexanol, diethyl phthalate) at 298.15 K. The experimental data have been correlated using NRTL equation [4], and have been compared with the predicted values using ASOG-LLE parameters.
The solvent selectivity of liquid-liquid extraction will be useful from the practical point of view. The selectivity of solvents has been discussed using distribution coefficients. Our experimental data and literature values including ionic liquids have been then used for discussing using ASOG-LLE parameters.
References
[1] B. E. Poling, J. M. Prausnitz and J. P. O’Connell: The Properties of GASES AND LIQUIDS, 5th ed., McGraw-Hill (2001)
[2] H. Renon and J. M. Prausnitz: AIChE J., 14, 135 (1968)
[3] K. Tochigi, H. Matsuda, K. Yokoyama, T. Tsuji and K. Kurihara: J. Solution Chem., (2025) [https://doi.org/10.1007/s10953-025-01443-6]
[4] K. Yokoyama, H. Matsuda, K. Kurihara and K. Tochigi: Kagaku Kogaku Ronbunshu, 38, 69 (2012)