ABSTRACT

The isobaric molar heat capacities as a function of temperature and pressure are, for the first time, reported for a set of imidazolium-based ionic liquids. The selected compounds belong to the 1-alkyl-3-methylimidazolium series, concretely, [Emim][BF4], [Bmim][BF4], [Hmim][BF4], and [Omim][BF4]. Isobaric heat capacity were determined in the temperature and pressure intervals of (283.15 to 323.15) K and (0.1 to 60) MPa using a micro DSCII calorimeter recently adapted to work at high pressure. The data at atmospheric pressure were compared with literature data; as a rule, good results were obtained for all liquids. Isobaric molar heat capacities for the studied ionic liquids show quite a different behavior than that obtained for usual organic solvents, which could be understood as these compounds behave like highly compressed molecular fluids. This is consistent with the behavior of other previously reported thermodynamic properties.

Compounds

#	Formula	Name
1	C6H11BF4N2	1-ethyl-3-methylimidazolium tetrafluoroborate
2	C8H15BF4N2	1-butyl-3-methylimidazolium tetrafluoroborate
3	C10H19BF4N2	1-hexyl-3-methylimidazolium tetrafluoroborate
4	C12H23BF4N2	1-methyl-3-octylimidazolium tetrafluoroborate

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	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	117
POMD	2	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	117
POMD	3	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	117
POMD	4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Small sample (50 mg) DSC	117

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

Pressure and Temperature Dependence of Isobaric Heat Capacity for [Emim][BF4], [Bmim][BF4], [Hmim][BF4], and [Omim][BF4]

Sanmamed, Y. A.[Yolanda A.], Navia, P.[Paloma], Gonzalez-Salgado, D.[Diego], Troncoso, J.[Jacobo], Romani, L.[Luis]

ABSTRACT