The Effect of Polymer Molar Mass on the Aqueous Two-Phase System Containing Poly Ethylene Glycol Dimethyl Ether and Ammonium Sulphate at 298.15 K and Its Application of This System in Partitioning of Iodine

The partitioning of iodide was studied in an aqueous two phase system (ATPS) comprised ofammonium sulphate, poly ethylene glycol dimethyl ether (PEGDME), and water at 298.15 K. Toinvestigate the effect of molar mass of the polymer on the tie-line, similar measurements werealso made at T=298.15 K on this two phase system consisting of the PEGDME with molarmasses of 250, 500 and 2000 g.mol-1. Finally the effect of molar mass of polymer on the binodalof {PEGDME + ammonium sulphate +water} was studied by measuring liquid-liquidequilibrium at T= 298.15 K for three different molar masses. The experimental binodal data weredescribed using two empirical nonlinear three parameter expressions developed by Merchuk [1]and Zafarani Moattar et al [2]. The increase in the polymer molar mass provides ATPS with largerbiphasic region. The tie-line compositions were estimated and correlated using the Othmer–Tobias and Bancroft [3] and Setschenow type equations [4]. In addition the partitioning behaviourof the iodine [5] molecule on the investigated aqueous two-phase system was studied.

کلیدواژه ها:

Liquid-Liquid Equilibrium ، Ammonium Sulphate ، Setschenow Type Equation ، Poly Ethylene Glycol Dimethyl Ether ، Iodine Partitioning