ABSTRACT

Herein, we studied the absorption of H2S and CO2 in 1-methylimidazolium bis(2-ethylhexyl) sulfosuccinate ([mim][doc]) and 1-buthyl-3-methylimidazolium bis(2-ethylhexyl) sulfosuccinate ([bmim][doc]) at various temperatures and partial gas pressures. The choice of the [doc] anion was determined by the ability of bulky moieties along with the polar functional groups to enhance the solubility of acidic gases, as confirmed during the volumetric measurements of gases solubility. It was shown that the protic cation presence determines a significant reduction of the CO2 and H2S solubilities as well as the thermal stability of ILs. There were found that [bmim][doc] tends to have higher absorption capacity toward acidic gases compared with [mim][doc]. The solubility of hydrogen sulfide, characterized by the Henry's Law constant, in [bmim][doc] and [mim][doc] turned out nearly 4-5 and 1.5-2 times higher than in conventional ionic liquids respectively.

Compounds

#	Formula	Name
1	C24H44N2O7S	1-methyl-1H-imidazolium 1,4-bis((2-ethylhexyl)oxy)-1,4-dioxobutane-2-sulfonate
2	C28H52N2O7S	1-butyl-3-methyl-1H-imidazolium 1,4-bis((2-ethylhexyl)oxy)-1,4-dioxobutane-2-sulfonate
3	CO2	carbon dioxide
4	H2S	hydrogen sulfide
5	H2O	water

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 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mass fraction - 5; Liquid	Liquid	Vibrating tube method	5
POMD	1 5	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mass fraction - 5; Liquid	Liquid	Concentric cylinders viscometry	5
POMD	2 5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mass fraction - 5; Liquid	Liquid	Vibrating tube method	5
POMD	2 5	Viscosity, Pa*s ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid Mass fraction - 5; Liquid	Liquid	Concentric cylinders viscometry	5
POMD	3 1 5	Molality, mol/kg - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Solvent: Mass fraction - 5; Liquid	Liquid Gas	volumetric method	16
POMD	3 2 5	Molality, mol/kg - 3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Solvent: Mass fraction - 5; Liquid	Liquid Gas	volumetric method	16
POMD	4 1 5	Molality, mol/kg - 4 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Solvent: Mass fraction - 5; Liquid	Liquid Gas	volumetric method	16
POMD	4 2 5	Molality, mol/kg - 4 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Solvent: Mass fraction - 5; Liquid	Liquid Gas	volumetric method	16

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Solubility of H2S and CO2 in imidazolium-based ionic liquids with bis(2-ethylhexyl) sulfosuccinate anion

Akhmetshina, Alsu I., Petukhov, Anton N., Gumerova, Olesya R., Vorotyntsev, Andrey V., Nyuchev, Alexander V., Vorotyntsev, Ilya V.

ABSTRACT