Temperature dependent excess free energy of mixing and excess molar polarization of the binary mixture of butanols in nonpolar solvents

The excess free energy of mixing and excess molar polarization in the binary mixture of butanols and nonpolar solvents are evaluated at different temperatures starting from 303 K to 318 K. Decreases in correlation factor, excess free energy of mixing and excess molar polarization have been observed with an increase in temperature. However, excess molar polarization does not vary much with respect to temperature at about 0.1 molar concentrations of polar liquids. In some mixtures, at this concentration excess molar polarization increases slightly with an increase in temperature. The excess free energy of mixing and excess molar polarization are higher in the binary mixtures of polar solutes with n-heptane due to the presence of an odd number of carbon atoms. It is important to observe that there is slight variation in excess free energy and excess molar polarization in these polar-nonpolar binary mixtures with respect to temperature. The excess free energy of mixing remains positive at all temperatures for most of the concentrations of polar solvents in polar-nonpolar binary liquid mixtures. This is an advantage to use such polar-nonpolar binary molecules for industrial applications.