2SO4/MgSO4 at different temperatures]]>

摘要

Abstract Liquid-liquid equilibrium data (LLE) were obtained for aqueous two-phase systems (ATPS) composed of 2-propanol?+?inorganic salt (Na2SO4 or MgSO4)?+?water, at different temperatures T?= (293.15, 303.15, 313.15 e 323.15) K. The effect of temperature on the binodal curves and tie-lines was studied. Temperature increase resulted in an expansion of the biphasic region, and this effect was more pronounced in the systems composed of 2-propanol?+?Na2SO4. A nonlinear equation was used to describe the binodal curves in terms of the mass fraction of 2-propanol versus sulfate salt. The effects of the different salts (Na2SO4 or MgSO4) on the phase-separation abilities of the studied ATPS was discussed using the values of parameters in the effective excluded volume (EEV) model. The salting-out abilities of the investigated salts followed the order Na2SO4 MgSO4. The experimental results of LLE were correlated using the UNIFAC model. Calculated RMS deviations between the experimental and predicted LLE compositions for the 2-propanol?+?Na2SO4 and 2-propanol?+?MgSO4 systems were 1.76 and 0.68%, respectively. The UNIFAC model was able to effectively represent the studied biphasic aqueous systems.