Distribution of n-alkanols between water and n-alkanes

Abstract

The distribution ratios for 20°C of four n-alkanols between water and each of three n-alkanes have been determined. Combination of the results with calorimetrically-determined heats of solution of the alkanols in water and in alkanes at high dilution have yielded standard free energies, heats and entropies of transfer of the alkanols from water to the alkanes. The standard free energies and entropies of solution of alkanols in the alkanes have also been derived. In addition, integral heats of solution of 1-octanol in n-decane at 20, 25 and 30°C have been determined in a concentration region where association of the alcohol is occurring. These heats can be adequately explained using an association model proposed by Heller and Fletcher, based on infra-red measurements.