ABSTRACT

New experimental results are reported for the solubility of carbon dioxide (CO2) in nitrate- and thiocyanate-based ionic liquids (ILs) at temperatures ranging from 298.15 to 333.15 K and pressure up to 4.5 MPa. The studied ILs are 1-methyl 3-octylimidazolium thiocyanate [Omim][SCN], 1-methyl 3-hexylimidazolium thiocyanate [Hmim][SCN], 1-methyl 3-octylimidazolium nitrate [Omim][NO3], and 1-butyl 3-methylimidazolium tetrafluoroborate [Bmim][BF4]. The solubility measurements are performed in a known volume stainless steel equilibrium cell. The experimental data indicated the solubility of CO2 decreases with increasing of temperature. Henry s constant are calculated from the solubility data. The experimental results for CO2 solubility are correlated with the extended Henry s law and Pitzer virial expansion using binary parameters. The correlation results of gas solubility are agreed with the experimental data.

Compounds

#	Formula	Name
1	C13H23N3S	1-methyl-3-octyl-1H-imidazolium thiocyanate
2	C11H19N3S	1-hexyl-3-methylimidazolium thiocyanate
3	C8H15BF4N2	1-butyl-3-methylimidazolium tetrafluoroborate
4	C12H23N3O3	1-methyl-3-octylimidazolium nitrate
5	CO2	carbon dioxide

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	Vibrating tube method	3
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	3
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	3
POMD	5 2	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Molality, mol/kg - 5; Liquid		Liquid Gas	Closed cell (Static) method	15
POMD	5 1	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Molality, mol/kg - 5; Liquid		Liquid Gas	Closed cell (Static) method	16
POMD	5 4	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Molality, mol/kg - 5; Liquid		Liquid Gas	Closed cell (Static) method	20
POMD	5 3	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Molality, mol/kg - 5; Liquid		Liquid Gas	Closed cell (Static) method	20

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

Experimental Study on the Solubility of Carbon Dioxide in Nitrate and Thiocyanate-Based Ionic Liquids

Mokhtarani, B.[Babak], Khatun, A. N.[Abolfazi Negar], Mafi, M.[Morteza], Sharifi, A.[Ali], Mirzaei, M.[Mojtaba]

ABSTRACT