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 of ammoniumsulphate, poly ethylene glycol dimethyl ether (PEGDME), and water at 298.15 K. To investigate the effect of molarmass of the polymer on the tie-line, similar measurements were also made at T=298.15 K on this two phase systemconsisting of the PEGDME with molar masses of 250, 500 and 2000 g.mol-1. Finally the effect of molar mass ofpolymer on the binodal of {PEGDME + ammonium sulphate +water} was studied by measuring liquid-liquidequilibrium at T= 298.15 K for three different molar masses. The experimental binodal data were described using twoempirical nonlinear three parameter expressions developed by Merchuk and Zafarani Moattar et al. The increase in thepolymer molar mass provides ATPS with larger biphasic region. The tie-line compositions were estimated andcorrelated using the Othmer–Tobias and Bancroft and Setschenow type equations. In addition the partitioningbehaviour of the iodine 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