Liquid–liquid equilibria of aqueous two phase system containing of PEGDME 2000 and (NH4)2 SO4 at different temperatures and its application in partitioning of lactic acid

In this work, the Liquid-liquid equilibria (LLE) of {PEGDME2000 +ammonium sulphate +water} was studied at T= (298.15, 308.15 and 318.15) K. Furthermore for this system the freeenergies, enthalpies and entropies of cloud points were calculated at the mentioned temperaturesin order to investigate the driving force for mentioned two-phase system. For representing theexperimental binodal data the Merchuk equation [1] in the original form and with the temperaturedependency and an empirical equation were used. Othmer-Tobias [2] and Bancraft, a temperaturedependent Setschenow [3] and osmotic virial model [4] were used to fit the tie-line data.Moreover, the effect of temperature on the binodal curves and the tie-lines for the investigatedaqueous two-phase system have been studied. In addition the partitioning behaviour of the lacticacid [5] molecule on the investigated aqueous two-phase system was studied.

کلیدواژه ها:

(Liquid–liquid) Equilibrium ، Polyethylene Glycol Di-Methyl Ether ، Ammonium Sulphate ، Setschenow Equation ، Lactic Acid