Thermochemical study of the solvation of alkanes in mixtures of methanol with butyl alcohol isomers

A calorimetric method was applied at 25 degrees C to measure the enthalpies of dissolution of cyclohexane, heptane, and decane in the methanol-n-butan ol mixed solvent and hexadecane in mixtures of methanol,with n-, iso-, and tert-butyl alcohols. The standard enthalpies of dissolution of alkanes were determined. It was shown that the equation proposed in the literature for calculation of the enthalpies of dissolution of alkanes in mixtures with no nspecific intermolecular solvent-solvent interactions describes satisfactor ily the enthalpies of dissolution of alkanes in mixtures of methanol with n - and iso-butyl alcohols. It was suggested that there is no preferential so lvation of alkanes by one of the mixed solvent components in the MeOH-(BuOH )-O-n and MeOH-(BuOH)-O-i mixtures; in the MeOH-(BuOH)-O-t system, the comp osition of alkane solvation shell differs slightly from the solvent composi tion in the bulk.