Si trova su / Altri legami
© In this study, the temperature effect on the aqueous two–phase systems composed of isopropanol + trisodium citrate + water was studied by experimental measurement of the binodal curves and tie–line compositions at T = 288.15, 298.15, 308.15, and 318.15 K temperatures. It was found that the salting–out ability of the system was increased with increasing the temperature so that the extension of the two–phase area, especially in the salt–rich region, was increased by raising the temperature. Correlation of the tie–line compositions to a Seteschenow–type equation also showed that the two–phase formation tendency of the studied systems has a positive correlation with the salting–out parameters, Kca, of this equation so that Kca values were increased with increasing the temperature. Binodal curves at all studied temperatures were successfully fitted to two temperature–dependent equations with only three fitting parameters, simultaneously. Also, the electrolyte–Wilson model was modified as a function of temperature and used for simultaneous correlation of the tie–line data at all studied temperatures. An excellent agreement between the calculated values of the modified electrolyte–Wilson model and the experimental results was obtained.
