Dielectric constant of mixed solvents based on perturbation theory

Industrial applications such as batteries and bio-separations require modeling the thermodynamic properties of mixed solvent electrolytes. Thermodynamic models for electrolytes often consider solvents a dielectric continuum characterized by their constant. Therefore, accurate predictions physically sound model constant solvents, depending on temperature, pressure, mixture composition. We present physical pure mixtures based perturbation theory. The analytical expression is third order in dipole density. For each component, requires moment two adjustable pure-component parameters. apply to binary methanol–water ethylene glycol–water considering component experimental data temperatures between 273.15 K 823.15 pressures 0.1 MPa 1189.0 MPa. presented improves prediction both compared linear molar mixing rule, achieves similar accuracies volume-based mass-based rules. show that suitable case scarce data.