The effect of potassium chloride on the liquid-liquid equilibrium in the ternary system (2-butoxyethanol+2,3-butanediol+water) at 70 degrees 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).