ABSTRACT

Over the past few years, interest has increased regarding the application of ionic liquids (ILs) as extraction solvents for separating azeotropic mixtures. Following this trend, this work presents the experimental data of liquid liquid equilibria (LLE) of the system envolving water, ethanol, and 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF6]) at different temperatures. The LLE data of the system was measured between 283.2 and 323.2 K to determine the temperature influence on the system. In the literature, reports of systems involving ILs that present type II behavior are scarce compared with those that present type I behavior; the system presented here also displays two immiscibility zones in the ternary system. The universal quasichemical (UNIQUAC) and nonrandom two-liquid (NRTL) models were applied to correlate the ternary system. Both of the models obtained fit the equilibrium compositions and showed type II behavior; nevertheless, UNIQUAC presented a better result. Finally, the solvent ability of the IL for the purpose of separating the mixture formed by ethanol and water was evaluated and compared with other ionic liquids studied in the literature.

Compounds

#	Formula	Name
1	C8H15F6N2P	1-butyl-3-methylimidazolium hexafluorophosphate
2	H2O	water
3	C2H6O	ethanol

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	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	1	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	2	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Vibrating tube method	1
POMD	3	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Standard Abbe refractometry	1
POMD	3 2 1	Mole fraction - 3 ; Liquid mixture 1 Mole fraction - 3 ; Liquid mixture 2 Mole fraction - 2 ; Liquid mixture 2	Temperature, K; Liquid mixture 2 Mole fraction - 2; Liquid mixture 1	Pressure, kPa; Liquid mixture 2	Liquid mixture 1 Liquid mixture 2	OTHER OTHER OTHER	48
POMD	2 1	Mole fraction - 2 ; Liquid mixture 2	Temperature, K; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 2 Liquid mixture 1	OTHER	3
POMD	2 1	Mole fraction - 2 ; Liquid mixture 1	Temperature, K; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Chromatography + gravimetric	3
POMD	3 1	Mole fraction - 3 ; Liquid mixture 2	Temperature, K; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 2 Liquid mixture 1	OTHER	3
POMD	3 1	Mole fraction - 3 ; Liquid mixture 1	Temperature, K; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Chromatography + gravimetric	3

Thermodynamics Research Center / ThermoML | Journal of Chemical and Engineering Data

Experimental determination and correlation of liquid-liquid equilibria data for a system of water + ethanol +1-butyl-3- methylimidazolium hexafluorophosphate at different temperatures

Chafer, A.[Amparo], de la Torre, J.[Javier], Monton, J. B.[Juan B.], Lladosa, E.[Estela]

ABSTRACT