Liquid–Liquid Equilibrium of Some Aliphatic Alcohols + Disodium Tartrate + Water Aqueous Two-Phase Systems at 298.15 K

In the present work, the liquid–liquid equilibrium of 1-propanol, 2-propanol, 2-methyl-2-propanol, or 2-butanol + disodium tartrate + water aqueous two-phase systems was studied. The experimental binodal curves and tie-line compositions at 298.15 were reported, and the effect of temperature on the phase separation ability of these systems was studied using cloud-point data as a function of alcohol mole fractions at the (293.15 to 323.15) K temperature range with 5 K successive intervals. The effective excluded volume (EEV) model was also was used to describe the salting-out ability in the studied systems. A simple three-parameter empirical equation was successfully used for the correlation of the binodal data, and the modified electrolyte Wilson model for mixed solvent electrolyte systems was used for the correlation of the tie-line compositions. The restricted binary interaction parameters were also reported. Good agreement between the experimental and the calculated tie-line compositions was observed