(683h) Modeling the Viscosity of Aqueous Solutions of Fully Dissociated Electrolytes Using Entropy Scaling with the Electrolyte PC-SAFT Equation of State

The viscosity of aqueous electrolyte solutions plays an important role in a variety of technological, engineering and geochemical applications. Accurate correlations of electrolyte viscosities across wide ranges of temperatures, pressures, and concentrations are needed for optimum process design.

In the past 15 years or so, entropy scaling has gained attention as a promising semi-empirical approach in the development of engineering models for transport properties of common fluids covering the gas, liquid, and supercritical states, however, extensions to aqueous electrolyte solutions have so far received little attention.

In this work, we present an entropy scaling model based on the ePC-SAFT equation of state to correlate the viscosity of aqueous electrolyte solutions made of ten different salts (KBr, KCl, KI, Li₂SO₄, LiCl, LiI, Na₂SO₄, NaBr, NaCl, and NaI) over the experimental data temperature-pressure-concentration range available in literature with good accuracy. The model is also capable of predicting the viscosity of mixtures containing water and 2 salts with acceptable accuracy.