Termochemistry of Aniline Solution in Mixtures of Alcohols with Dihexyl Ether

The heats of solution of aniline and cyclohexane in mixtures of methanol, 1-butanol, and 1-octanol with dihexyl ether at 25°C in the entire range of compositions of the mixed solvents were measured. The enthalpies of transfer of aniline and cyclohexane from dihexyl ether to its mixtures with alcohols were calculated. It was suggested that, in methanol-based systems, the major factor is the interaction of the alcohol as an acid with aniline as a base, whereas in butanol- and octanol-based system the larger contribution is made by the interaction of the alcohol as a base with aniline as an acid.