ABSTRACT

The purpose of this work is to determine the solubility of greenhouse gases in different ionic liquids (ILs). Experimental values for the solubility of carbon dioxide, methane and nitrous oxide in ionic liquids are measured at different temperatures and at pressures close to atmospheric. Carbon dioxide is the most soluble gas studied with mole fraction solubility of the order of 10-2 and nitrous oxide is one order of magnitude less soluble than carbon dioxide, whereas methane is the least soluble gas. Finally, we strove to develop a group contribution method in order to determine the Henry's law constant of CO2 as a function of temperature. We can thus establish a general expression of Henry's law constant of CO2 which may be used to predict the CO2 solubility in ionic liquids when experimental data are unavailable.

Compounds

#	Formula	Name
1	CO2	carbon dioxide
2	CH4	methane
3	N2O	nitrous oxide
4	C8H15BF4N2	1-butyl-3-methylimidazolium tetrafluoroborate
5	C10H16BF4N	1-butyl-3-methylpyridinium tetrafluoroborate
6	C8H11F6N3O4S2	1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide
7	C9H15F3N2O3S	1-butyl-3-methylimidazolium trifluoromethanesulfonate
8	C6H11F6N2OP	3-(2-hydroxyethyl)-1-methylimidazolium hexafluorophosphate
9	C8H11F6N3O5S2	1-(2-hydroxyethyl)-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide
10	C9H13F6N3O5S2	1-(2-methoxyethyl)-3-methyl-1H-imidazolium bis((trifluoromethyl)sulfonyl)amide
11	C11H22F6N2O4S2	hexyltrimethylammonium bis[(trifluoromethyl)sulfonyl]imide
12	C34H68F6NO4PS2	trihexyl(tetradecyl)phosphonium bis[(trifluoromethyl)sulfonyl]imide
13	C16H32N2O4S	1-butyl-3-methylimidazolium octyl sulfate
14	C6H13N2O3P	1,3-dimethylimidazolium methyl phosphonate
15	C12H15F10N3O4S2	1-butyl-3-methylimidazolium bis(perfluoroethylsulfonyl)imide
16	C6H11BF4N2O	1-(2-hydroxyethyl)-3-methylimidazolium 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 11	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	1 12	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	1 15	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	1 6	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	1 7	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	1 5	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	1 4	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	1 14	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	1 16	Mole fraction - 1 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	3 11	Mole fraction - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	6
POMD	3 12	Mole fraction - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	5
POMD	3 15	Mole fraction - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	5
POMD	3 6	Mole fraction - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	3 7	Mole fraction - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	3 5	Mole fraction - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	3 4	Mole fraction - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	3
POMD	3 16	Mole fraction - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	5
POMD	3 13	Mole fraction - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	2 11	Mole fraction - 2 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	2 6	Mole fraction - 2 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	5
POMD	2 7	Mole fraction - 2 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	5
POMD	2 4	Mole fraction - 2 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	2 14	Mole fraction - 2 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	2 16	Mole fraction - 2 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	2 8	Mole fraction - 2 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	5
POMD	3 10	Mole fraction - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	3 9	Mole fraction - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	5
POMD	3 8	Mole fraction - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	5
POMD	2 13	Mole fraction - 2 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	4
POMD	2 9	Mole fraction - 2 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid Gas	Phase equilibration	5

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Solubility of carbon dioxide, nitrous oxide and methane in ionic liquids at pressures close to atmospheric

Chen, Y.[Yushu], Mutelet, F.[Fabrice], Jaubert, J.-N.[Jean-Noel]

ABSTRACT