ABSTRACT

The liquid-liquid coexistence curves in a temperature range of about 10 K from the upper consolute point and the specific isobaric heat capacities in a wide temperature range for the critical binary solution of {ethanol + 1-butyl-3-methylimidazolium hexafluorophosphate} have been reported. The critical exponents corresponding to the heat capacity and the coexistence curve were deduced and found to be consistent with theoretical predictions. The complete scaling theory was used to analyze the asymmetric behavior of the diameter of the coexistence curve, which confirmed that the heat capacity related term was of importance. The crossover behavior from the 3D-Ising to the mean field was examined and shown to be monotonic and more pronounced than that of simple fluids. It was also found that the systemdependent critical amplitude A+ for the heat capacity had a comparative large value, and the reduced critical parameters calculated from the restricted primitive model (RPM) were significantly larger than the characteristic RPM values, indicating the nature of solvophobic criticality.

Compounds

#	Formula	Name
1	C8H15F6N2P	1-butyl-3-methylimidazolium hexafluorophosphate
2	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	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	minimum deviation method	6
POMD	2	Refractive index (other wavelength) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	minimum deviation method	6
POMD	1 2	Upper consolute composition: mole fraction - 1 ; Liquid mixture 1			Liquid mixture 1 Liquid mixture 2 Air at 1 atmosphere	equal voume method	1
POMD	1 2	Upper consolute temperature, K ; Liquid mixture 1			Liquid mixture 1 Liquid mixture 2 Air at 1 atmosphere	equal volume method	1
POMD	1 2	Mole fraction - 1 ; Liquid mixture 1	Temperature, K; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	Index of refraction calibration data	45
POMD	1 2	Mole fraction - 1 ; Liquid mixture 2	Temperature, K; Liquid mixture 1	Pressure, kPa; Liquid mixture 1	Liquid mixture 2 Liquid mixture 1	Index of refraction calibration data	45
POMD	1 2	Refractive index (other wavelength) ; Liquid mixture 1	Temperature, K; Liquid mixture 1	Pressure, kPa; Liquid mixture 1 Wavelength, nm; Liquid mixture 1	Liquid mixture 1 Liquid mixture 2	minimum deviation method	45
POMD	1 2	Refractive index (other wavelength) ; Liquid mixture 2	Temperature, K; Liquid mixture 2	Pressure, kPa; Liquid mixture 2 Wavelength, nm; Liquid mixture 2	Liquid mixture 2 Liquid mixture 1	minimum deviation method	45
POMD	1 2	Refractive index (other wavelength) ; Liquid	Mole fraction - 1; Liquid Temperature, K; Liquid	Pressure, kPa; Liquid Wavelength, nm; Liquid	Liquid	minimum deviation method	78
POMD	1 2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mole fraction - 1; Liquid	Liquid	Large sample (1 g) DSC	105

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Liquid-liquid equilibrium and heat capacity measurements of the binary solution {ethanol + 1-butyl-3-methylimidazolium hexafluorophosphate}

Guo, Y.[Yimin], Wang, X.[Xue], Tao, X.[Xiaoyi], Shen, W.[Weiguo]

ABSTRACT