Vapor-liquid equilibrium for phenanthrene-toluene mixtures at elevated temperatures and pressures

Vapor and liquid equilibrium compositions are reported for the phenanthrene-toluene system at 593, 633, and 675 K and at pressures ranging from 7.3 bar to the binary mixture critical pressure at each temperature. Mixture critical pressures were obtained by visual observation of critical opalescence within a view cell. A flow apparatus for measuring VLE and LLE that is capable of operation at pressures up to 350 bar and temperatures to 675 K is also described. The apparatus can be used with materials such as phenanthrene and petroleum pitches which are solids at room temperature.