SOLID LIQUID-PHASE EQUILIBRIA OF BINARY AND TERNARY MIXTURES OF BENZENE AND POLYNUCLEAR AROMATIC-COMPOUNDS

Solid-liquid equilibrium phase diagrams for three binary mixtures of benzene with polynuclear aromatic compounds (fluorene, dibenzofuran, and dibenzothiophene) have been measured by a dynamic method in the temperature range from 0 to 80-degrees-C. These binary data plus previously published data derived from calorimetric studies were used to determine experimental activity coefficients and interaction parameters using the Wilson and UNIQUAC models. The resulting set of interaction parameters gave a good representation of the experimental binary data and ternary data at 50-degrees-C, but were not generally satisfactory for predicting solid-liquid equilibrium in ternary systems at lower temperatures.