ABSTRACT

New experimental results are presented for the solubility and diffusivity of difluoromethane in 19 room-temperature ionic liquids (RTILs). In the series of RTILs presented here, eight RTILs with five new fluorocarbon sulfonate anions have been prepared for the first time. The measurements were performed using a gravimetric microbalance at temperatures between (283.15 and 348.15) K and at pressures from (0.01 to 1.0) MPa. Experimental gas solubility data were successfully correlated with the nonrandom two-liquid (NRTL) solution model. The solubility of difluoromethane in RTILs is affected by the choice of both the cation and anion. Diffusivities obtained from the time-dependent absorption data were well analyzed using a model based on a modified Stokes-Einstein equation. The calculated molecular size for difluoromethane is 2 to 3 times larger than the known size.

Compounds

#	Formula	Name
1	C10H16F4N2O3S	1-butyl-3-methylimidazolium 1,1,2,2-tetrafluoroethanesulfonate
2	C8H12F4N2O3S	1-ethyl-3-methyl-1H-imidazolium 1,1,2,2-tetrafluoroethane-1-sulfonate
3	C13H22F4N2O3S	1-heptyl-3-methylimidazolium 1,1,2,2-tetrafluoroethanesulfonate
4	C18H32F4N2O3S	1-dodecyl-3-methylimidazolium 1,1,2,2-tetrafluoroethanesulfonate
5	C11H14F6N2O4S2	3-methyl-1-propylpyridinium bis(trifluoromethylsulfonyl)imide
6	C12H15F9N2O6S3	1,2-dimethyl-3-propylimidazolium tris(trifluoromethylsulfonyl)methide
7	C10H15F6N3O4S2	1,2-dimethyl-3-propylimidazolium bis[(trifluoromethyl)sulfonyl]imide
8	C10H11F10N3O4S2	1-ethyl-3-methylimidazolium 1,1,2,2,2-pentafluoro-N-[(pentafluoroethyl)sulfonyl]ethanesulfonamide
9	C12H16F6N2O4S2	1-butyl-3-methylpyridinium 1,1,1-trifluoro-N-[(trifluoromethyl)sulfonyl]methanesulfonamide
10	C10H18N2O2	1-butyl-3-methylimidazolium acetate
11	C9H15N3S	1-butyl-3-methylimidazolium thiocyanate
12	C9H18N2O4S	1-butyl-3-methylimidazolium methyl sulfate
13	C11H16F6N2O3S	1H-Imidazolium, 3-butyl-1-methyl-, 1,1,2,3,3,3-hexafluoro-1-propanesulfonate (1:1)
14	C12H16F8N2O4S	1-butyl-3-methylimidazolium 2-(1,2,2,2-tetrafluoroethoxy)-1,1,2,2-tetrafluoroethanesulfonate
15	C12H16F8N2O4S	1-butyl-3-methylimidazolium 1,1,2-trifluoro-2-(perfluoroethoxy)ethanesulfonate
16	C11H16F6N2O4S	1-butyl-3-methylimidazolium 1,1,2-trifluoro-2-(trifluoromethoxy)ethanesulfonate
17	CH2F2	difluoromethane
18	C8H11F6N3O4S2	1-ethyl-3-methylimidazolium bis((trifluoromethyl)sulfonyl)imide

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	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	2	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	3	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	4	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	5	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	6	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	7	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	8	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	9	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	10	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	11	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	12	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid	Pycnometric method	1
POMD	13	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	14	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	15	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	16	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	18	Mass density, kg/m3 ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Vibrating tube method	4
POMD	17 6	Thermal diffusivity, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 17; Liquid		Liquid Gas	time dependent absorption data	25
POMD	17 6	Mole fraction - 17 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	gravimetric microbalance	31
POMD	17 8	Thermal diffusivity, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 17; Liquid		Liquid Gas	gravimetric microbalance	25
POMD	17 8	Mole fraction - 17 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	gravimetric microbalance	31
POMD	17 18	Mole fraction - 17 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	gravimetric microbalance	31
POMD	17 18	Thermal diffusivity, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 17; Liquid		Liquid Gas	time dependent absorption data	24
POMD	17 5	Mole fraction - 17 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	gravimetric microbalance	31
POMD	17 5	Thermal diffusivity, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 17; Liquid		Liquid Gas	time dependent absorption data	25
POMD	17 1	Mole fraction - 17 ; Liquid	Pressure, kPa; Liquid	Temperature, K; Liquid	Liquid Gas	gravimetric microbalance	8
POMD	17 1	Thermal diffusivity, m2/s ; Liquid	Mole fraction - 17; Liquid	Temperature, K; Liquid	Liquid Gas	time dependent absorption data	7
POMD	17 2	Mole fraction - 17 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	gravimetric microbalance	8
POMD	17 2	Thermal diffusivity, m2/s ; Liquid	Mole fraction - 17; Liquid	Temperature, K; Liquid	Liquid Gas	time dependent absorption data	6
POMD	17 3	Mole fraction - 17 ; Liquid	Pressure, kPa; Liquid	Temperature, K; Liquid	Liquid Gas	gravimetric microbalance	8
POMD	17 3	Thermal diffusivity, m2/s ; Liquid	Mole fraction - 17; Liquid	Temperature, K; Liquid	Liquid Gas	time dependent absorption data	8
POMD	17 4	Mole fraction - 17 ; Liquid	Pressure, kPa; Liquid	Temperature, K; Liquid	Liquid Gas	gravimetric microbalance	8
POMD	17 4	Thermal diffusivity, m2/s ; Liquid	Mole fraction - 17; Liquid	Temperature, K; Liquid	Liquid Gas	time dependent absorption data	7
POMD	17 7	Mole fraction - 17 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	gravimetric microbalance	8
POMD	17 7	Thermal diffusivity, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 17; Liquid		Liquid Gas	time dependent absorption data	8
POMD	17 9	Mole fraction - 17 ; Liquid	Pressure, kPa; Liquid	Temperature, K; Liquid	Liquid Gas	gravimetric microbalance	8
POMD	17 9	Thermal diffusivity, m2/s ; Liquid	Mole fraction - 17; Liquid	Temperature, K; Liquid	Liquid Gas	time dependent absorption data	6
POMD	17 10	Mole fraction - 17 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	gravimetric microbalance	8
POMD	17 10	Thermal diffusivity, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 17; Liquid		Liquid Gas	time dependent absorption data	8
POMD	17 11	Mole fraction - 17 ; Liquid	Pressure, kPa; Liquid	Temperature, K; Liquid	Liquid Gas	gravimetric microbalance	8
POMD	17 11	Thermal diffusivity, m2/s ; Liquid	Mole fraction - 17; Liquid	Temperature, K; Liquid	Liquid Gas	time dependent absorption data	7
POMD	17 12	Mole fraction - 17 ; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid		Liquid Gas	gravimetric microbalance	8
POMD	17 12	Thermal diffusivity, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 17; Liquid		Liquid Gas	time dependent absorption data	8
POMD	17 13	Mole fraction - 17 ; Liquid	Pressure, kPa; Liquid	Temperature, K; Liquid	Liquid Gas	gravimetric microbalance	8
POMD	17 13	Thermal diffusivity, m2/s ; Liquid	Mole fraction - 17; Liquid	Temperature, K; Liquid	Liquid Gas	time dependent absorption data	8
POMD	17 14	Mole fraction - 17 ; Liquid	Pressure, kPa; Liquid	Temperature, K; Liquid	Liquid Gas	gravimetric microbalance	8
POMD	17 14	Thermal diffusivity, m2/s ; Liquid	Mole fraction - 17; Liquid	Temperature, K; Liquid	Liquid Gas	time dependent absorption data	7
POMD	17 15	Mole fraction - 17 ; Liquid	Pressure, kPa; Liquid	Temperature, K; Liquid	Liquid Gas	gravimetric microbalance	8
POMD	17 15	Thermal diffusivity, m2/s ; Liquid	Mole fraction - 17; Liquid	Temperature, K; Liquid	Liquid Gas	time dependent absorption data	8
POMD	17 16	Mole fraction - 17 ; Liquid	Pressure, kPa; Liquid	Temperature, K; Liquid	Liquid Gas	gravimetric microbalance	8
POMD	17 16	Thermal diffusivity, m2/s ; Liquid	Mole fraction - 17; Liquid	Temperature, K; Liquid	Liquid Gas	time dependent absorption data	8

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

Solubility and Diffusivity of Difluoromethane in Room-Temperature Ionic Liquids

Shiflett, M. B.[Mark B.], Harmer, M. A.[Mark A.], Junk, C. P.[Christopher P.], Yokozeki, A.

ABSTRACT