Solubility and thermodynamic properties of musk xylene in binary mixed solvents from t = (278.15 to 313.15) K

Abstract

In this study, the solubility of musk xylene in four binary solvents (ethyl acetate + methanol, ethyl acetate + ethanol, ethyl acetate + isopropanol, and ethyl acetate + n-butanol) was measured by the isothermal saturation method at temperatures ranging from 278.15 K to 313.15 K under atmospheric pressure. The results indicate that the solubility of musk xylene increases with increasing temperature and ethyl acetate mass fraction. The experimental solubility data of musk xylene were correlated by five thermodynamic models, including modified Apelbla equation, λh equation, Van't Hoff equation, Sun model and Jouyban–Acree model. All models can be well correlated with the experimental data of solubility. The Jouyban–Acree model provides the best correlation in this study. The thermodynamic properties of the standard dissolution enthalpy (ΔsolH○), the standard dissolution Gibbs (ΔsolG○), the standard dissolution entropy (ΔsolS○), %ξH and %ξTS of musk xylene in the selected binary solvent were calculated based on the van't Hoff equation. Results show that the dissolution of musk xylene in the selected binary solvent is endothermic and entropy-driven. This study can provide basic physical property data for crystallization and industrial separation of musk xylene.