ABSTRACT

Six hygroscopic ionic liquids (ILs), [DMIM][DMPO4], [EMIM][MeSO3], [EMIM][EtSO4], [EMIM][Et(EG)2SO4], [BMIM][BF4], and [choline][glycolate], were investigated with regard to their suitability as a drying agent for technical gas dehydration processes by absorption. Therefore, the density, viscosity, activity coefficient of water in the ILs, and the kinetic parameters of thermal and oxidative degradation were measured (if the respective values were not already reported in the literature). [EMIM][MeSO3] proved to be the most suitable candidate for industrial gas dehydration. This IL has a low activity coefficient, a high thermal and oxidation stability, an acceptably low viscosity as well as a very low vapor pressure. Thus, the influence of temperature on the activity coefficient of water and the diffusivity of water in this IL was also determined.

Compounds

#	Formula	Name
1	H2O	water
2	C8H16N2O4S	1-ethyl-3-methylimidazolium ethyl sulfate
3	C7H15N2O4P	1,3-dimethylimidazolium dimethylphosphate
4	C7H14N2O3S	1-ethyl-3-methylimidazolium methanesulfonate
5	C12H24N2O6S	1-ethyl-3-methylimidazolium 2-(2-ethoxyethoxy)ethylsulfate
6	C8H15BF4N2	1-butyl-3-methylimidazolium tetrafluoroborate
7	C7H17NO4	choline glycolate

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	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	8
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	8
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	8
POMD	5	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid		Liquid Gas	Langmuir	12
POMD	6	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid		Liquid Gas	Langmuir	19
POMD	7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Pycnometric method	8
POMD	7	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid		Liquid Gas	Langmuir	18
POMD	1 4	Kinematic viscosity, m2/s ; Liquid	Temperature, K; Liquid Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	54
POMD	1 4	Boiling temperature at pressure P, K ; Liquid	Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	17
POMD	1 4	Activity coefficient - 1 ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	OTHER: determination of a dew point for vapor over solution:sMethod:EP	58
POMD	1 4	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid	Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid	magnetic suspension balance	5
POMD	1 3	Kinematic viscosity, m2/s ; Liquid	Temperature, K; Liquid Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	56
POMD	1 3	Boiling temperature at pressure P, K ; Liquid	Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	20
POMD	1 2	Kinematic viscosity, m2/s ; Liquid	Temperature, K; Liquid Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	56
POMD	1 2	Boiling temperature at pressure P, K ; Liquid	Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	20
POMD	1 5	Kinematic viscosity, m2/s ; Liquid	Temperature, K; Liquid Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	56
POMD	1 5	Boiling temperature at pressure P, K ; Liquid	Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	28
POMD	1 6	Kinematic viscosity, m2/s ; Liquid	Temperature, K; Liquid Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	56
POMD	1 6	Boiling temperature at pressure P, K ; Liquid	Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	16
POMD	1 7	Kinematic viscosity, m2/s ; Liquid	Temperature, K; Liquid Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid	Capillary tube (Ostwald; Ubbelohde) method	56
POMD	1 7	Boiling temperature at pressure P, K ; Liquid	Mass fraction - 1; Liquid	Pressure, kPa; Liquid	Liquid Gas	Ebulliometric method (Recirculating still)	27

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

Characterization of Six Hygroscopic Ionic Liquids with Regard to Their Suitability for Gas Dehydration: Density, Viscosity, Thermal and Oxidative Stability, Vapor Pressure, Diffusion Coefficient, and Activity Coefficient of Water

Krannich, M.[Michel], Heym, F.[Florian], Jess, A.[Andreas]

ABSTRACT