Liquid-liquid equilibria of an aqueous two-phase system containing poly(ethylene) glycol 1500 and sulfate salts at different temperatures

Martins JP; Carvalho CD; da Silva LHM; Coimbra JSD; da Silva MDH; Rodrigues GD; Minim LA

Journal of Chemical and Engineering Data, Vol.53, No.1, 238-241, 2008

Martins JP, Carvalho CD, da Silva LHM, Coimbra JSD, da Silva MDH, Rodrigues GD, Minim LA

Phase diagrams of aqueous two-phase systems composed of poly(ethylene) glycol (PEG) 1500, lithium sulfate, or magnesium sulfate were determined at (283.15, 298.15, and 313.15) K and of PEG 1500 + sodium sulfate were obtained at (278.15, 298.15, 305.65, and 313.15) K. The temperature effect on the position of the binodal curves was negligible, indicating a small enthalpic contribution to the phase separation process. The ability of the three salts to induce the formation of a biphasic system with PEG 1500 followed the order MgSO4 > Na2SO4 > Li2SO4.