Abstract
Solid–liquid equilibria for binary mixtures formed by biphenyl and
n
-tetracosane and ternary mixtures formed by
n
-tetracosane + dibenzofuran + biphenyl were experimentally determined using differential scanning calorimetry (DSC). The liquidus lines were established from the onset temperatures of the melting peaks observed in the thermograms. The experimental data were compared to predictions made by a thermodynamic model considering ideal solution. Non idealities were also computed by means of the group contribution method UNIFAC. Original UNIFAC and several modifications such as UNIFAC-Lyngby and UNIFAC-Dortmund versions were assessed. The polymorphism phenomenon was considered and the heat capacity contribution was supposed to be negligible since the involved compound have nearby melting points. The best description is obtained with UNIFAC-Lyngby method, which leads to the lowest deviations in melting temperature and activity coefficients. This work contributes to acquire knowledge about solid–liquid phase behavior of multi-components systems containing heavy
n
-alkanes and aromatics, which is scarce in literature.