The study of phase behavior of aqueous 1-propanol/2-propanol/2-butanol/2-methyl-2-propanol systems in the presence of disodium tartrate or disodium succinate at T = 298.15 K

Liquid–liquid equilibria (LLE) of the 1-propanol/2-propanol/2-butanol/2-methyl-2-propanol + disodium tartrate or disodium succinate + water systems have been measured at T = 298.15 K. The Merchuk et al. equation was used to correlate the obtained binodal data. The effect of some factors such as length of alcohol chain, polarity of alcohol and the type of salt on the phase behavior of these systems has been discussed. In addition, the experimental tie-lines were reproduced using the Othmer–Tobias and Bancroft, Setschenow-type equations and the generalized electrolyte-NRTL and generalized Wilson models. Finally, the plait points of these investigated systems were estimated.

► Tie-line data are reported for aliphatic alcohols + sodium tartrate + water systems. ► Tie-line data are reported for aliphatic alcohols + sodium succinate + water systems. ► The effect of alcohols chain, polarity and anions are discussed. ► The plait points of these investigated systems were estimated. ► Tie-lines data were fitted to Setschenow-type equation, e-NRTL and Wilson models.