(Solid + liquid) equilibria of (phenanthrene + dichlorobenzenes)

(Solid + liquid) equilibria (SLE) have been measured for phenanthrene + o-dichlorobenzene, phenanthrene + m-dichlorobenzene and phenanthrene + p-dichlorobenzene using differential scanning calorimetry (DSC) over the whole concentration range. It was found that all systems are simple eutectic systems. The eutectic point of (phenanthrene + o-dichlorobenzene) mixture is at −25.0 °C and 0.0767 mole fraction of phenanthrene, (phenanthrene + m-dichlorobenzene) mixture at −28.0 °C and 0.0530 mole fraction of phenanthrene and (phenanthrene + p-dichlorobenzene) mixture at 33.6 °C and 0.3060 mole fraction of phenanthrene. Furthermore, the activity coefficients of components in binary mixtures have been correlated by the Scatchard–Hildebrand expression with one adjustable parameter. This approach offers a useful procedure for estimating with good accuracy.