Three-phase liquid-liquid-vapor equilibria of the binary mixture carbon dioxide plus 1-methylnaphthalene

The liquid-liquid-vapor (llg) partial miscibility behavior of the mixture c arbon dioxide + 1-methylnaphthalene was experimentally studied by use of a visual cell (stoichiometric) technique. Pressure, phase compositions, and m olar volumes of the two liquid phases in equilibrium are reported as a func tion of temperature along the llg locus. The three-phase locus is terminate d above by an upper critical end point (l-l=g) at 308.81 K and 79.30 bars a nd below by a four-phase quadruple point (sllg) at 219.05 K and 5.68 bar an d has an isopycnic inversion at approximately 245.5 K and 15.6 bar.