ABSTRACT

In this research, the (liquid + liquid) and (vapour + liquid) equilibria of polyethylene glycol 2000 with salts Na2SO4, ZnSO4, (NH4)2SO4, Al2(SO4)3 and MgSO4 were investigated. Constant water activity curves and water activity data for the (vapour + liquid) equilibrium have been measured using the isopiestic method at T = 298.15 K. Furthermore, binodal values of aqueous two-phase systems for (liquid + liquid) equilibrium were determined at T = (298.15 and 308.15) K. A relation between the salting-out effect of electrolytes on the polymer aqueous solution and the slopes of constant water activity curves are reported. It was found that the slopes of constant water activity curves of aqueous two-phase systems, in two-phase and one-phase regions, have positive and negative deviation, respectively, from the linear isopiestic relation. Finally, the effect of temperature and cation of sulphate salts on the (liquid + liquid) and (vapour + liquid) equilibria was investigated

Compounds

#	Formula	Name
1	MgO4S	magnesium sulfate
2	Na2O4S	sodium sulfate
3	O4SZn	zinc sulfate
4	Al2O12S3	aluminum sulfate
5	H8N2O4S	ammonium sulfate
6	H2O	water

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	1 6	(Relative) activity - 6 ; Liquid	Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	isopiestic	5
POMD	6 2	(Relative) activity - 6 ; Liquid	Molality, mol/kg - 2; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	isopiestic	5
POMD	6 3	(Relative) activity - 6 ; Liquid	Molality, mol/kg - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	isopiestic	5
POMD	6 4	(Relative) activity - 6 ; Liquid	Molality, mol/kg - 4; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	isopiestic	5
POMD	6 5	(Relative) activity - 6 ; Liquid	Molality, mol/kg - 5; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	isopiestic	4

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Thermodynamic equilibrium of the polyethylene glycol 2000 and sulphate salts solutions

Jahani, F.[Farahnaz], Abdollahifar, M.[Mozaffar], Haghnazari, N.[Nahid]

ABSTRACT