ABSTRACT

Experimental measurements of excess molar enthalpy, density, and isobaric molar heat capacity are presented for a set of binary systems ionic liquid + water as a function of temperature at atmospheric pressure. The studied ionic liquids are 1-butyl-3-methylpyridinium tetrafluoroborate, 1-ethyl-3-methylimidazolium ethylsulfate, 1-butyl-3-methylimidazolium methylsulfate, 1-butyl-3-methylimidazolium trifluoromethanesulfonate, and 1-ethyl-3-methylimidazolium trifluoromethanesulfonate. Excess molar enthalpy was measured at 303.15 K whereas density and heat capacity were determined within the temperature range (293.15 to 318.15) K. From experimental data, excess molar volume and excess molar isobaric heat capacity were calculated. The analysis of the excess properties reveals important differences between the studied ionic liquids which can be ascribed to their capability to form hydrogen bonds with water molecules.

Compounds

#	Formula	Name
1	H2O	water
2	C10H16BF4N	1-butyl-3-methylpyridinium tetrafluoroborate
3	C8H16N2O4S	1-ethyl-3-methylimidazolium ethyl sulfate
4	C9H18N2O4S	1-butyl-3-methylimidazolium methyl sulfate
5	C9H15F3N2O3S	1-butyl-3-methylimidazolium trifluoromethanesulfonate
6	C7H11F3N2O3S	1-ethyl-3-methylimidazolium trifluoromethanesulfonate

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	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	6
POMD	1	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	6
POMD	3	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	6
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	6
POMD	4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	6
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	6
POMD	5	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	6
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	6
POMD	6	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	6
POMD	6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	6
POMD	1 3	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	CALVET:UFactor:2	10
POMD	1 3	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Mole fraction - 3; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	60
POMD	1 3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Mole fraction - 3; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	60
POMD	1 4	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 4; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	CALVET:UFactor:2	9
POMD	1 4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Mole fraction - 4; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	66
POMD	1 4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Mole fraction - 4; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	72
POMD	1 6	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 6; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	CALVET:UFactor:2	9
POMD	1 6	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Mole fraction - 6; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	66
POMD	1 6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Mole fraction - 6; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	66
POMD	1 5	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 5; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	CALVET:UFactor:2	8
POMD	1 5	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Mole fraction - 5; Liquid	Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	54
POMD	1 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Mole fraction - 5; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	84
POMD	1 2	Excess molar enthalpy (molar enthalpy of mixing), kJ/mol ; Liquid	Mole fraction - 2; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	CALVET:UFactor:2	8

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Excess enthalpy, density, and heat capacity for binary systems of alkylimidazolium-based ionic liquids + water

Garcia-Miaja, G.[Gonzalo], Troncoso, J.[Jacobo], Romani, L.[Luis]

ABSTRACT