Thermodynamic fundamentals of liquid-liquid phase equilibria for binary mixtures have been described in detail. The relationship between free energy of mixing and composition is presented. Further, the relationship between activity and composition is also discussed. In this study, the heptane + methanol and the octane + methanol binary systems have been examined for example to understand the relationships between compositions at liquid-liquid equilibria and free energy of mixing or activity of the binary mixtures.
Liquid-liquid equilibrium
Thermodynamic fundamental
Binary system
Free energy of mixing
Activity
Heptane
Octane
Methanol