ABSTRACT

In this study, diffusion coefficients of alkylimidazolium tetrafluoroborates and hexafluorophosphates ionic liquids in water at room temperature were measured by the Taylor dispersion experiment. The Wilke Chang equation underestimated the diffusion coefficient, but a modified Wilke Chang equation correlated diffusion coefficients well with molar volumes. The conductivities of these ion liquids were also measured. Infinite dilute conductances were calculated. The Nernst Haskell equation accurately estimated diffusion coefficients using the infinite dilute conductance obtained.

Compounds

#	Formula	Name
1	C6H11BF4N2	1-ethyl-3-methylimidazolium tetrafluoroborate
2	C8H15BF4N2	1-butyl-3-methylimidazolium tetrafluoroborate
3	C10H19BF4N2	1-hexyl-3-methylimidazolium tetrafluoroborate
4	C12H23BF4N2	1-methyl-3-octylimidazolium tetrafluoroborate
5	C6H11F6N2P	1-ethyl-3-methylimidazolium hexafluorophosphate
6	C8H15F6N2P	1-butyl-3-methylimidazolium hexafluorophosphate
7	C10H19F6N2P	1-hexyl-3-methylimidazolium hexafluorophosphate
8	C12H23F6N2P	1-octyl-3-methylimidazolium hexafluorophosphate
9	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	Phase	Method	#Points
POMD	9 1	Molar conductivity, S*m2/mol ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	1
POMD	9 1	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 1; Liquid Pressure, kPa; Liquid	Liquid	Taylor dispersion method	1
POMD	9 2	Molar conductivity, S*m2/mol ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	1
POMD	9 2	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 2; Liquid Pressure, kPa; Liquid	Liquid	Taylor dispersion method	1
POMD	9 3	Molar conductivity, S*m2/mol ; Liquid	Temperature, K; Liquid Mole fraction - 3; Liquid Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	1
POMD	9 3	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 3; Liquid Pressure, kPa; Liquid	Liquid	Taylor dispersion method	1
POMD	9 4	Molar conductivity, S*m2/mol ; Liquid	Temperature, K; Liquid Mole fraction - 4; Liquid Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	1
POMD	9 4	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 4; Liquid Pressure, kPa; Liquid	Liquid	Taylor dispersion method	1
POMD	9 5	Molar conductivity, S*m2/mol ; Liquid	Temperature, K; Liquid Mole fraction - 5; Liquid Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	1
POMD	9 5	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 5; Liquid Pressure, kPa; Liquid	Liquid	Taylor dispersion method	1
POMD	9 6	Molar conductivity, S*m2/mol ; Liquid	Temperature, K; Liquid Mole fraction - 6; Liquid Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	1
POMD	9 6	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 6; Liquid Pressure, kPa; Liquid	Liquid	Taylor dispersion method	1
POMD	9 7	Molar conductivity, S*m2/mol ; Liquid	Temperature, K; Liquid Mole fraction - 7; Liquid Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	1
POMD	9 7	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 7; Liquid Pressure, kPa; Liquid	Liquid	Taylor dispersion method	1
POMD	9 8	Molar conductivity, S*m2/mol ; Liquid	Temperature, K; Liquid Mole fraction - 8; Liquid Pressure, kPa; Liquid	Liquid	Alternating current cell with electrodes	1
POMD	9 8	Binary diffusion coefficient, m2/s ; Liquid	Temperature, K; Liquid Mole fraction - 8; Liquid Pressure, kPa; Liquid	Liquid	Taylor dispersion method	1

Thermodynamics Research Center / ThermoML | Fluid Phase Equilibria

Diffusion coefficients and conductivities of alkylimidazolium tetrafluoroborates and hexafluorophosphates

Su, W. C.[Wen Cheng], Chou, C. H.[Cheng Huang], Wong, D. S. H.[David Shan Hill], Li, M. -H.[Meng-Hui]

ABSTRACT