Phase diagrams of systems composed of polyethylene(glycol) (PEG) 1500 + sodium citrate + water and PEG 4000 + sodium citrate + water were determined at temperatures of (10, 35, and 45) °C and (5, 10, 25, 35, and 45) °C, respectively. The influence of temperature and PEG molar mass on the equilibrium data of the system was analyzed. Binodal curves shifted toward the origin with the increase in PEG molar mass.

Liquid-liquid equilibrium data of aqueous two-phase systems composed of polyethylene(glycol) (PEG) 4000 + zinc sulfate at (5, 10, 35, and 45) °C were measured. The effect of temperature in the systems was studied. The expansion of the two-phase area with the increase in temperature from (5 to 35) °C and also a small reduction of the biphasic region from (35 to 45) °C were observed. The slope of all tie lines increased with the temperature increase. The tie line length increased in the ranges of (5 to 25) °C and (35 to 45) °C and decreased from (25 to 35) °C.

Phase equilibrium data of an aqueous two-phase system composed of poly(ethylene oxide) 4000 + copper sulfate + water were determined at four temperatures, (5, 10, 35, and 45) °C. The phase separation was entropically driven as can be seen by the small influence of temperature on the phase diagram. However, the rise in temperature increased both the tie line length and the slope of the tie line.

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