ABSTRACT

In this work, the experimental values of density, speed of sound, refractive index and dynamic viscosity have been obtained from T = (293.15 to 343.15)Kfor the three phosphonium-based ionic liquids: tributyl methyl phoshponium methylsulfate (P4441 C1SO4), tributyl ethyl phosphonium diethylphosphate (P4442 (C2)2PO4) and tributyl octyl phosphonium chloride (P4448 Cl). The isentropic compressibility has been calculated by means of the Laplace equation from the experimental speed of sound results for the three ionic liquids at different temperatures. Density, speed of sound, refractive index and isentropic compressibility have been correlated by polynomial equations. The Lorentz-Lorenz, Dale-Gladstone, Eykman, Oster, Arago-Biot, Newton and modified Eykman equations were the empirical models used to correlate satisfactorily the relationship between the densities and refractive indices of the ionic liquids selected. The temperature dependence of the experimental dynamic viscosities for the ionic liquids selected can be described by an Arrhenius-like law and by VFT equations.The Riedel, Narsimham, Bradford-Thodos, Yen-Woods, Rackett, Spencer-Danner, Gunn-Yamada,Hankinson-Thomson (COSTALD model), VSY, VSD, MH and LGM equations were employed to predict the densities of the pure ionic liquids.

Compounds

#	Formula	Name
1	C14H33O4PS	tributylmethylphosphonium methyl sulfate
2	C18H42O4P2	tributylethylphosphonium diethylphosphate
3	C20H44ClP	tributyloctylphosphonium 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	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	11
POMD	1	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	1	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	11
POMD	1	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	11
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	11
POMD	2	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	2	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	11
POMD	2	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	11
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	11
POMD	3	Speed of sound, m/s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Sing-around technique in a fixed-path interferometer	11
POMD	3	Refractive index (Na D-line) ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Standard Abbe refractometry	11
POMD	3	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Falling or rolling sphere viscometry	11

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Study of thermodynamic and transport properties of phosphonium-based ionic liquids

Deive, F. J.[Francisco J.], Rivas, M. A.[Miguel A.], Rodriguez, A.[Ana]

ABSTRACT