(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 degrees C and 0.0767 mole fraction of phenanthrene, (phenanthrene + m-dichlorobenzene) mixture at -28.0 degrees C and 0.0530 mole fraction of phenanthrene and (phenanthrene + p-dichlorobenzene) mixture at 33.6 degrees 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. (c) 2008 Elsevier B.V. All rights reserved.