Collect. Czech. Chem. Commun. 1982, 47, 1045-1059

Heats of mixing of the ternary systems 1-propanol-n-alkane-cyclohexane

František Veselý, Vladimír Dohnal and Miloslav Prchal

Department of Physical Chemistry, Prague Institute of Chemical Technology, 166 28 Prague 6


Heats of mixing HE were measured at the temperature of 298 15 K in the ternary system 1-propanol-n-hexane-cyclohexane, 1-propanol-n-heptane-cyclohexane and 1-propanol-n-octane cyclohexane along three pseudobinary chorids and in the binary system 1-propanol-n-hexane. The measured values of the ternary excess enthalpies were correlated by the Scatchard equation for one polar component and by the SSF equation in pseudobinary mixtures. A very good agreement with the experiments was attained on computing the enthalpies of mixing by the group-contribution method. Qualitatively the same results were found on applying the modified Renon-Prausnitz model of continuously associated solution. The combination of the Renon-Prausnitz model with the group-contribution method did not yield a more conspicuous improvement.