ABSTRACT

Experimental density measurements are reported along with the derived thermodynamic properties (isothermal compressibility, isobaric expansivity, and thermal pressure coefficient) for trihexyltetradecylphosphonium-based ionic liquids chloride, bromide, bis(trifluoromethylsulfonyl)imide, dicyanamide and methyl sulfonate in the pressure range (0.10 to 45.00 MPa) and temperature range (283.15 to 333.15) K. The effect of the anion of the ionic liquid on the properties under study was evaluated. Experimental densities were correlated using the Tait equation, the modified cell model equation of state, and the Sanchez-Lacombe equation of state, and compared against the predictive method proposed by Gardas and Coutinho. It is shown that the three correlations describe well all the ILs studied, with the Tait equation providing the lowest average relative deviation (less than 0.004 %) and the Sanchez-Lacombe equation of state the highest (inferior to 0.5 %), and that the predicted densities estimated by Gardas and Coutinho method are in good agreement with the experimental densities determined.

Compounds

#	Formula	Name
1	C32H68ClP	trihexyl(tetradecyl)phosphonium chloride
2	C32H68BrP	tetradecyltrihexylphosphonium bromide
3	C34H68F6NO4PS2	trihexyl(tetradecyl)phosphonium bis[(trifluoromethyl)sulfonyl]imide
4	C34H68N3P	tetradecyl(trihexyl)phosphonium dicyanamide
5	C33H71O3PS	trihexyltetradecylphosphonium methanesulfonate

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	Phase	Method	#Points
POMD	1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:6	84
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:6	84
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:6	84
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:6	84
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:6	84

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

Measurements and Correlation of High-Pressure Densities of Phosphonium Based Ionic Liquids

Tome, L. I. N.[Luciana I.N.], Gardas, R. L.[Ramesh L.], Carvalho, P. J.[Pedro J.], Pastoriza-Gallego, M. J.[Maria Jose], Pineiro, M. M.[Manuel M.], Coutinho, J. A. P.[Joao A. P.]

ABSTRACT