Liquid−liquid equilibrium (LLE) data of the solubility curves and tie-line compositions have been determined for mixtures of (water + 3-hydroxy-2-butanone +1-butanol) at 298.15 K, 308.15 K, and 318.15 K and 101.3 kPa. Distribution coefficients and separation factors have been evaluated for the immiscibility region. The reliability of the experimental tie-lines has been confirmed by using Othmer−Tobias correlation. The LLE data of the ternary systems have been predicted by the UNIFAC method.
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