ABSTRACT

Liquid-liquid equilibrium data for N-butylpyridinium tetrafluoroborate ([BPy]BF4) + Salt(disodium hydrogen phosphate, sodium chloride, sodium sulfate, and ammonium sulfate) + H2O systems have been determined experimentally at T = 298.15 K. The binodal curves are fitted to an empirical nonlinear expression developed by Merchuk, and the tie lines were described by the Othmer-Tobias, Bancroft, and two-parameter equations. Factors affecting the binodal curves such as salts are also studied. It was found that the salting-out behavior indicates that Na2HPO4 greater than Na2SO4 greater than (NH4)2SO4 greater than NaCl, which may be related to the Gibbs free energy of hydration of the ions. Furthermore, the tie-line was also discussed to evaluate the phase separation abilities of the investigated systems. These data are exposed to be useful for the development and design of the extraction process using ILs

Compounds

#	Formula	Name
1	HNa2O4P	disodium hydrogen phosphate
2	H2O	water
3	C9H14BF4N	1-butylpyridinium tetrafluoroborate
4	Na2O4S	sodium sulfate
5	H8N2O4S	ammonium sulfate
6	ClNa	sodium chloride

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 2 3	Mass fraction - 1 ; Liquid mixture 1	Mass fraction - 3; Liquid mixture 1	Temperature, K; Liquid mixture 1 Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	70
POMD	1 2 3	Mass fraction - 1 ; Liquid mixture 2 Mass fraction - 1 ; Liquid mixture 1 Mass fraction - 3 ; Liquid mixture 1	Mass fraction - 3; Liquid mixture 2	Pressure, kPa; Liquid mixture 1 Temperature, K; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	atomic absorption spectroscopy atomic absorption spectroscopy atomic absorption spectroscopy	3
POMD	2 4 3	Mass fraction - 4 ; Liquid mixture 1	Mass fraction - 3; Liquid mixture 1	Temperature, K; Liquid mixture 1 Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	56
POMD	2 4 3	Mass fraction - 4 ; Liquid mixture 2 Mass fraction - 4 ; Liquid mixture 1 Mass fraction - 3 ; Liquid mixture 1	Mass fraction - 3; Liquid mixture 2	Pressure, kPa; Liquid mixture 1 Temperature, K; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	atomic absorption spectroscopy atomic absorption spectroscopy atomic absorption spectroscopy	3
POMD	2 5 3	Mass fraction - 5 ; Liquid mixture 1	Mass fraction - 3; Liquid mixture 1	Pressure, kPa; Liquid mixture 1 Temperature, K; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	90
POMD	2 5 3	Mass fraction - 5 ; Liquid mixture 2 Mass fraction - 5 ; Liquid mixture 1 Mass fraction - 3 ; Liquid mixture 1	Mass fraction - 3; Liquid mixture 2	Pressure, kPa; Liquid mixture 1 Temperature, K; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	electrical conductivity electrical conductivity electrical conductivity	3
POMD	6 2 3	Mass fraction - 6 ; Liquid mixture 1	Mass fraction - 3; Liquid mixture 1	Pressure, kPa; Liquid mixture 1 Temperature, K; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Titration method	13
POMD	6 2 3	Mass fraction - 6 ; Liquid mixture 2 Mass fraction - 6 ; Liquid mixture 1 Mass fraction - 3 ; Liquid mixture 1	Mass fraction - 3; Liquid mixture 2	Pressure, kPa; Liquid mixture 1 Temperature, K; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	atomic absorption spectroscopy atomic absorption spectroscopy atomic absorption spectroscopy	3

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Liquid-liquid equilibria of ionic liquid N-butylpyridiniumtetrafluoroborate and disodium hydrogen phosphate/sodiumchloride/sodium sulfate/ammonium sulfate aqueous two-phase systems at T = 298.15 K: Experiment and correlation

Li, Y.[Yuliang], Zhang, M.[Mengshi], Wu, J.[Jinna], Shi, J.[Jianglin], Shen, C.[Cheng]

ABSTRACT