Solid‐liquid equilibria in n‐alkylbenzene + n‐alkane mixtures. A group contribution study of phase diagrams

The solid‐liquid equilibrium diagrams of following 11 binary systems were determined: benzene, toluene, ethylbenzene, n‐propylbenzene, and n‐butylbenzene + n‐heptane or n‐tetradecane and benzene + n‐dodecane. All these diagrams could be calculated accurately (maximum deviation ca. 1 K) in terms of the group‐contribution theory (in the random mixing approximation) developed by Kehiaian et al. [7], which is essentially the surface version of the Guggenheim‐Barker lattice theory. Most interchange parameters were identical to those derived previously [7, 31, 33] from experimental data (liquid‐vapor equilibria, excess enthalpies, excess heat capacities). Where experimental data were lacking, the parameters were estimated and finely adjusted to the observed equilibrium diagrams.