ABSTRACT

A semi-infinite volume technique was used to measure the diffusion coefficients of six hydrofluorocarbons in three room-temperature ionic liquids in the temperature range from 303.2 K to 343.2 K. The Henry s constants were also determined at the same time. The hydrofluorocarbons are difluoromethane (R-32), pentafluoroethane (R-125), fluoroethane (R-161), 1,1,1-trifluoroethane (R-143a), 2,3,3,3- tetrafluoropropene (R-1234yf), and 1,1-difluoroethane (R-152a). The room-temperature ionic liquids are 1-hexyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([HMIM][Tf2N]), 1-hexyl-3- methylimidazolium trifluoromethanesulfonate ([HMIM][TfO]), and 1-hexyl-3-methylimidazolium tetrafluoroborate ([HMIM][BF4]). The diffusion coefficients and the Henry s constants of hydrofluorocarbons in the three RTILs all increase with the increasing temperature, but the orders of them are different. In addition, the relationship between the diffusion coefficient and the Henry s constant was investigated. Finally, the Wilke-Chang equation was successfully applied to correlate the diffusion coefficients of hydrofluorocarbons in room-temperature ionic liquids.

Compounds

#	Formula	Name
1	CH2F2	difluoromethane
2	C12H19F6N3O4S2	1-hexyl-3-methylimidazolium bis[(trifluoromethyl)sulfonyl]imide
3	C2HF5	pentafluoroethane
4	C2H5F	fluoroethane
5	C2H3F3	1,1,1-trifluoroethane
6	C3H2F4	2,3,3,3-tetrafluoro-1-propene
7	C2H4F2	1,1-difluoroethane
8	C11H19F3N2O3S	1-hexyl-3-methylimidazolium trifluoromethanesulfonate
9	C10H19BF4N2	1-hexyl-3-methylimidazolium tetrafluoroborate
10	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	1 2	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 1; Liquid	Liquid	pressure decay method	5
POMD	3 2	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 3; Liquid	Liquid	pressure decay method	5
POMD	4 2	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 4; Liquid	Liquid	pressure decay method	5
POMD	5 2	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 5; Liquid	Liquid	pressure decay method	5
POMD	6 2	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 6; Liquid	Liquid	pressure decay method	5
POMD	7 2	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 7; Liquid	Liquid	pressure decay method	5
POMD	1 8	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid		Liquid Gas	Closed cell (Static) method	5
POMD	1 8	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 1; Liquid	Liquid	pressure decay method	5
POMD	3 8	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 3; Liquid		Liquid Gas	Closed cell (Static) method	5
POMD	3 8	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 3; Liquid	Liquid	pressure decay method	5
POMD	4 8	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 4; Liquid		Liquid Gas	Closed cell (Static) method	5
POMD	4 8	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 4; Liquid	Liquid	pressure decay method	5
POMD	5 8	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 5; Liquid		Liquid Gas	Closed cell (Static) method	5
POMD	5 8	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 5; Liquid	Liquid	pressure decay method	5
POMD	6 8	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 6; Liquid		Liquid Gas	Closed cell (Static) method	5
POMD	6 8	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 6; Liquid	Liquid	pressure decay method	5
POMD	7 8	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 7; Liquid		Liquid Gas	Closed cell (Static) method	5
POMD	7 8	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 7; Liquid	Liquid	pressure decay method	5
POMD	1 9	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid		Liquid Gas	Closed cell (Static) method	5
POMD	1 9	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 1; Liquid	Liquid	pressure decay method	5
POMD	3 9	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 3; Liquid		Liquid Gas	Closed cell (Static) method	5
POMD	3 9	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 3; Liquid	Liquid	pressure decay method	5
POMD	4 9	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 4; Liquid		Liquid Gas	Closed cell (Static) method	5
POMD	4 9	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 4; Liquid	Liquid	pressure decay method	5
POMD	5 9	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 5; Liquid		Liquid Gas	Closed cell (Static) method	5
POMD	5 9	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 5; Liquid	Liquid	pressure decay method	5
POMD	6 9	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 6; Liquid		Liquid Gas	Closed cell (Static) method	5
POMD	6 9	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 6; Liquid	Liquid	pressure decay method	5
POMD	7 9	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 7; Liquid		Liquid Gas	Closed cell (Static) method	5
POMD	7 9	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 7; Liquid	Liquid	pressure decay method	5
POMD	10 2	Vapor or sublimation pressure, kPa ; Liquid	Temperature, K; Liquid Mole fraction - 10; Liquid		Liquid Gas	Closed cell (Static) method	6
POMD	10 2	Binary diffusion coefficient, m2/s ; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Mole fraction - 10; Liquid	Liquid	pressure decay method	3

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Diffusion coefficients and Henry's constants of hydrofluorocarbons in [HMIM][Tf2N], [HMIM][TfO], and [HMIM][BF4]

He, M.[Maogang], Peng, S.[Sanguo], Liu, X.[Xiangyang], Pan, P.[Pei], He, Y.[Yongdong]

ABSTRACT