Solid-liquid equilibria (SLE) and liquidus lines for the ternary systems cyclohexane + benzene + 2-heptanone and acetonitrile + benzene + chloroform were determined by means of the synthetic visual method. The phase diagrams are represented in different graphical forms. The experimental SLE data were compared with results obtained by the modified UNIFAC (Dortmund) method. The prediction of ternary solid-liquid equilibria with the help of a reliable group contribution method is a suitable way for choosing selective solvents for extractive crystallization processes. A model comparison (original UNIFAC, modified UNIFAC (Dortmund), modified UNIFAC (Lyngby), and ASOG) for the prediction of about 325 ternary SLE systems taken from the Dortmund Data Bank shows superior results for mod. UNIFAC (Do) in comparison to the other methods.