MEASUREMENT AND PREDICTION OF TERNARY SOLID-LIQUID EQUILIBRIA

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