Application of Pitzer and six local composition models to correlate the mean ionic activity coefficients of aqueous 1-butyl-3-methylimidazolium bromide ionic liquid solutions obtained by EMF measurements
The mean ionic activity coefficients of aqueous 1-butyl-3-methylimidazolium bromide ([BMIm]Br) solutions in the concentrations ranging from 0.008 to 0.215 mol kg 1 were determined using potentiometric measurements at T = 308.15, 318.15, and 328.15 K. The obtained experimental data were correlated using the Pitzer and several local composition models, such as the non-electrolyte Wilson-NRF (N-Wilson-NRF), electrolyte Wilson-NRF (E-Wilson-NRF), electrolyte Wilson (E-Wilson), electrolyte NRTL (E-NRTL), modified electrolyte NRTL (ME-NRTL), and electrolyte NRTL-NRF (E-NRTL-NRF) models. The Pitzer parameters obtained were used to calculate the osmotic coefficients and excess Gibbs free energies of the solutions being studied. The results indicate that in general all the models used here can be successfully applied to predict the mean ionic activity coefficients of the aqueous ionic liquid solutions. However, the average standard deviations of the fit show that the NRTL based models represent the mean ionic activity coefficients with better precision.
Compounds
#
Formula
Name
1
H2O
water
2
C8H15BrN2
1-butyl-3-methylimidazolium bromide
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.