Enthalpic McMillan–Mayer coefficients from literature data on excess enthalpies. Application to solutions of alkanes in alkan-1-ols

Abstract

A method is described to calculate enthalpic McMillan–Mayer pair-interaction coefficients from literature data on excess enthalpies of binary mixtures. The calculation also yields the enthalpies of solution at infinite dilution. A test of the method of mixtures, for which directly measured enthalpic interaction coefficients are known, shows that the method gives results of reasonable accuracy. However, the method is able to obtain a large number of interaction coefficients in a relatively simple manner. This makes interpretation and correlation analyses of the results possible, and this is illustrated by the application of the method to alkane + alkan-1-ol mixtures. Results for alkanes dissolved in alkan-1-ols are discussed in terms of the Savage–Wood group-additivity treatment using one parameter for each solvent. In addition we present an empirical relation which makes it possible to correlate 49 enthalpic interaction coefficients of 6 different alkanes dissolved in 10 different alkan-1-ols with only one adjustable parameter.