ABSTRACT

Solubilities of ammonia in four conventional imidazolium ionic liquids: [Cnmim][BF4] (n = 2, 4, 6, 8) have been measured. Isothermally fixed temperatures are 293.15, 303.15, 313.15, 323.15 and 333.15 K; the pressure is from 0 to 1.0 MPa. High solubilities of ammonia are found, and it is also found that the solubilities of ammonia increase when the length of cations' alkyl chain increases (the ILs have the same anion), that is: [C8mim]+ greater than [C6mim]+ greater than [C4mim]+ greater than [C2mim]+. The solubility data have been correlated by the Krichevisky-Kasarnovsky equation, and then Henry's constants and partial molar volumes of NH3 at infinite dilution are obtained. The thermodynamic properties such as solution enthalpy, solution Gibbs free energy, solution entropy, and solution heat capacity of these systems are obtained.

Compounds

#	Formula	Name
1	H3N	ammonia
2	C6H11BF4N2	1-ethyl-3-methylimidazolium tetrafluoroborate
3	C8H15BF4N2	1-butyl-3-methylimidazolium tetrafluoroborate
4	C10H19BF4N2	1-hexyl-3-methylimidazolium tetrafluoroborate
5	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	Constraint	Phase	Method	#Points
POMD	1 2	Henry's Law constant (mole fraction scale), kPa - 1 ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Titration	5
POMD	1 2	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Titration method	25
POMD	1 3	Henry's Law constant (mole fraction scale), kPa - 1 ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Titration	5
POMD	1 3	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Titration method	25
POMD	1 4	Henry's Law constant (mole fraction scale), kPa - 1 ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Titration	5
POMD	1 4	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Titration method	25
POMD	1 5	Henry's Law constant (mole fraction scale), kPa - 1 ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid	Liquid Gas	Titration	5
POMD	1 5	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	Titration method	25

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Solubilities of ammonia in basic imidazolium ionic liquids

Li, G.[Guihua], Zhou, Q.[Qing], Zhang, X.[Xiangping], Wang, L.[Lei], Zhang, S.[Suojiang], Li, J.[Jianwei]

ABSTRACT