ABSTRACT

Mean activity coefficient values for NaCl in the mixture (water + ionic liquid) (IL) as solvent (IL being 1-ethyl-3-methyl-imidazolium methanesulfonate, [Emim][MeSO3] or 1-ethyl-3-methyl-imidazolium ethyl sulfate, [Emim][EtSO4]) were determined from the electrode potential measurements of the cell: Na (ISE) | NaCl (mA), ILs (w), H2O (1 w) | Cl (ISE) (ISE means ion selective electrode) at total ionic strengths ranging from 0.10 to 3.20 mol*kg 1 and at 298.15 K. Different weight fractions (w) of ILs (w = 0.01, 0.05, 0.1, 0.2, 0.3 and 0.4) were used. Data were fitted to the Pitzer model and the ion interaction parameters ss0, ss1, and C? were calculated. The osmotic coefficients of the solvent (water + IL), the solvent activity, the excess Gibbs free energy for the system were calculated. The negative sign in the excess free energy for the NaCl + IL+ H2O solvent mixture at 298.15 K suggests a spontaneous aggregation of {[Emim][MeSO3] + H2O} or {[Emim][EtSO4] + H2O}.

Compounds

#	Formula	Name
1	ClNa	sodium chloride
2	H2O	water
3	C8H16N2O4S	1-ethyl-3-methylimidazolium ethyl sulfate
4	C7H14N2O3S	1-ethyl-3-methylimidazolium methanesulfonate

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 3	Mean ionic activity coefficient - 1 ; Liquid	Molality, mol/kg - 1; Liquid Solvent: Mass fraction - 3; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Calculated from EMF cell potential	90
POMD	1 2 4	Mean ionic activity coefficient - 1 ; Liquid	Molality, mol/kg - 1; Liquid Solvent: Mass fraction - 4; Liquid	Pressure, kPa; Liquid Temperature, K; Liquid	Liquid	Calculated from EMF cell potential	90
POMD	2 3	Mass density, kg/m3 ; Liquid	Mass fraction - 3; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Vibrating tube method	6
POMD	2 4	Mass density, kg/m3 ; Liquid	Mass fraction - 4; Liquid	Temperature, K; Liquid Pressure, kPa; Liquid	Liquid	Vibrating tube method	6

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

Mean activity coefficients for NaCl in the mixtures containing ionic liquids [Emim] [MeSO3] + H2O and [Emim] [EtSO4] + H2O at 298.15 K

Amado-Gonzalez, E.[Eliseo], Esteso, M. A.[Miguel A.], Gomez-Jaramillo, W.[Wilfred]

ABSTRACT