Physical and transport properties of ionic liquids using geometric similitude and a cubic equation of state. Part 2: Thermal conductivity, and speed of sound of water + ionic liquid mixtures

The general equation of state based on the concept of geometric similarity presented in Part 1 of this series is extended to correlate and predict the thermal conductivity and the speed of sound of binary water + ionic liquid mixtures. The extension considers the classical mixing and combining rules commonly used in studies and applications of pressure-temperature-volume equations of state. Data on thermal conductivity and speed of sound of binary water + ionic liquids mixtures were gathered from the literature in the temperature range from 278 K to 343 K at atmospheric pressure. A total of 77 data for the thermal conductivity and 1560 data for the speed of sound for 28 binary mixtures are included in the study. The results of the extension to mixtures show that the empirical equation of state model provides adequate and consistent values using pure component data only, proving its good predictive capability.