ABSTRACT

The density and sound velocity of the solutions of room temperature ionic liquid 1-butyl-3-methyl-imidazolium bromide, BMIMBr, in water, methanol, and ethanol have been measured at T = (298.15 to 318.15) K at atmospheric pressure. Apparent molar volume and the apparent molar isentropic compressibility values have been evaluated from the experimental density and sound velocity data and fitted to a Redlich + Mayer type equation from which the apparent molar volume and apparent molar isentropic compressibility of the solutions at the infinite dilution have also been calculated at working temperatures. The obtained limiting apparent molar volume values and the limiting slope of the apparent molar volume versus molality1/2 indicate that ionic liquid + solvent interactions in water are stronger than the alcoholic solutions. An intersection point in isotherms of isentropic compressibility was observed for aqueous solutions may be an indication of the structural interactions and clathrate formation.

Compounds

#	Formula	Name
1	C8H15BrN2	1-butyl-3-methylimidazolium bromide
2	H2O	water
3	CH4O	methanol
4	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	2 1	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Linear variable-path acoustic interferometer	45
POMD	2 1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:16	45
POMD	3 1	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Linear variable-path acoustic interferometer	53
POMD	3 1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:16	55
POMD	4 1	Speed of sound, m/s ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	Linear variable-path acoustic interferometer	35
POMD	4 1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Molality, mol/kg - 1; Liquid	Pressure, kPa; Liquid	Liquid	VIBTUB:UFactor:16	35

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Apparent molar volume and isentropic compressibility of ionic liquid 1-butyl-3-methylimidazolium bromide in water, ethanol, and ethanol at T = (298.15 to 318.15) K

Zafarani-Moattar, M. T.[Mohamed], Shekaari, H.[Hemayat]

ABSTRACT