ABSTRACT

The solubility of carbon dioxide in room temperature ionic liquids (RTILs), dialkylimidazolium dialkylphosphates, was measured at 313-333 K and at pressures close to atmospheric pressure, from which Henry's law coefficients, standard Gibbs free energy, enthalpy, and entropy changes of solvation were derived. The C02 solubility in the dialkylimidazolium dialkylphosphate was found to increase with increasing chain length of the alkyl groups on the cation and/or the anion as was similarly found in other RTILs. Among various dialkylimidazolium dialkylphosphates tested, l-ethyl-3-methylimidazolium diethylphosphate ([EMIM][Et2P04)) and l-butyl-3-methylimidazolium dibutylphosphate ([BMIM][Bu2P04)) exhibited the comparable or better capability of dissolving C02 in comparison with that of [BMIM][BF4J, but their absorption capacities were still lower than that of l-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([BMIMJ[Tf2N)).

Compounds

#	Formula	Name
1	CO2	carbon dioxide
2	C10H21N2O4P	1-ethyl-3-methylimidazolium diethyl phosphate
3	C16H33N2O4P	1-butyl-3-methylimidazolium dibutyl phosphate
4	C10H15F6N3O4S2	1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide
5	C8H15BF4N2	1-butyl-3-methylimidazolium tetrafluoroborate
6	C7H15N2O4P	1,3-dimethylimidazolium dimethylphosphate
7	C8H16N2O4S	1-ethyl-3-methylimidazolium ethyl sulfate

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	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	3
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	3
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	3
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	3
POMD	6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	3
POMD	7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	3
POMD	1 3	Henry's Law constant (mole fraction scale), kPa - 1 ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid	Liquid Gas	estimated from slope of isotherm linear fit of fugacity vs mole fraction	3
POMD	1 3	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid		Liquid Gas	ISOPVT	18
POMD	1 2	Henry's Law constant (mole fraction scale), kPa - 1 ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid	Liquid Gas	estimated from slope of isotherm linear fit of fugacity vs mole fraction	3
POMD	1 2	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid		Liquid Gas	ISOPVT	22
POMD	1 6	Henry's Law constant (mole fraction scale), kPa - 1 ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid	Liquid Gas	estimated from slope of isotherm linear fit of fugacity vs mole fraction	3
POMD	1 6	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid		Liquid Gas	ISOPVT	12

Thermodynamics Research Center / ThermoML | Thermochimica Acta

Solubility of C02 in dialkylimidazolium dialkylphosphate ionic liquids

Palgunadi, J.[Jelliarko], Kang, J. E.[Je Eun], Nguyen, D. Q.[Dinh Quan], Kim, J. H.[Jin Hyung], Min, B. K.[Byoung Koun], Lee, S. D.[Sang Deuk], Kim, H.[Honggon], Kim, H. S.[Hoon Sik]

ABSTRACT