Estimation of the Activity Coefficients in Liquid Mixtures by Using Volumetric Data

Páez, Manuel J.; Portacio, Alfonso A.; Sánchez, L. C.

doi:10.1007/s10953-012-9873-9

Cited by 5 publications

(1 citation statement)

References 18 publications

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“…(a) Solid lines show current model with both μ j and r j w fit as parameters. Symbols: blue triangles, glycerol, Scatchard et al, Ninni et al; red circles, ethanol, Strey et al; green diamonds, methanol, Zhu et al; light-blue crosses, sucrose, Scatchard et al, Bubnik et al (data from Baeza et al 2010); black squares, 1,4-butanediol, Marcolli and Peter, Paez et al . (b) Relation between the r j w and μ j fit parameters for all organic species fit in this paper (eq ).…”

Section: Model Applications and Parameterizationmentioning

confidence: 95%

Isotherm-Based Thermodynamic Model for Electrolyte and Nonelectrolyte Solutions Incorporating Long- and Short-Range Electrostatic Interactions

et al. 2015

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The activities of solutes and solvents in solutions govern numerous physical phenomena in a wide range of practical applications. In prior work, we used statistical mechanics and multilayer adsorption isotherms to develop a transformative model for capturing thermodynamic properties of multicomponent aqueous solutions over the entire concentration range (Dutcher et al. J. Phys. Chem. 2011, 2012, 2013). That model needed only a few adsorption energy values to represent the solution thermodynamics of each solute. In the current work, we posit that the adsorption energies are due to dipole-dipole electrostatic forces in solute-solvent and solvent-solvent interactions. This hypothesis was tested in aqueous solutions on (a) 37 1:1 electrolytes, over a range of cation sizes, from H(+) to tetrabutylammonium, for common anions including Cl(-), Br(-), I(-), NO3(-), OH(-), ClO4(-), and (b) 20 water-soluble organic molecules including alcohols and polyols. For both electrolytes and organic solutions, the energies of adsorption can be calculated with the dipole moments of the solvent, molecular size of the solvent and solute, and the solvent-solvent and solvent-solute intermolecular bond lengths. Many of these physical properties are available in the literature, with the exception of the solute-solvent intermolecular bond lengths. For those, predictive correlations developed here enable estimation of solute and solvent solution activities for which there are little or no activity data.

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