Liquid−Liquid Equilibria in (2,3-Butanediol + 2-Butoxyethanol + Water + Potassium Chloride) at 70 °C

The effect of potassium chloride on the liquid−liquid equilibrium in the ternary system (2-butoxyethanol + 2,3-butanediol + water) at 70 °C is reported. Two salt concentrations were studied, (0.43 and 3.03) mass %. The addition of potassium chloride increases the heterogeneity region of the ternary diagram and also the selectivity. The consistency of the results was tested with the Othmer−Tobias, Hand, Brown, and Campbell correlations. Tie-line results have been correlated by the Eisen−Joffe equation and the empirical correlation of Vainerman et al. (mixtures with salt) and UNIQUAC and NRTL (salt-free basis).