In this work, an equation of state has been utilized
for thermodynamic
modeling of aqueous ionic liquid (IL) solutions. The proposed equation
of state is a combination of perturbed chain statistical associating
fluid theory (PC-SAFT) equation of state and mean spherical approximation
(MSA) term. In this model, the ion-based approach has been used to
adjust the model parameters. The ion parameters have been estimated
through simultaneous fitting to experimental mean ionic activity coefficient
and liquid density data of strong electrolytes. Using adjusted ion
parameters, osmotic coefficients, mean ionic activity coefficients,
liquid densities, apparent molar volume, and water activity of several
ILs, assumed as chainlike electrolytes, have been calculated. Results
show that PC-SAFT, in combination with the MSA term has acceptable
accuracy for prediction of density, apparent molar volume, and activity
coefficient of ILs. The average deviations of predicted mean ionic
activity coefficients, liquid densities, water activity, and apparent
molar volume are 6.43, 0.86, 0.033, and 8.20%, respectively.
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