MULTIPHASE EQUILIBRIUM BEHAVIOR OF THE MIXTURE ETHANE + METHANOL + 1-DECANOL

The liquid-liquid-vapor (LLV) phase equilibria of the ternary mixture ethane + methanol + 1-decanol were experimentally studied by using a visual cell (stoichiometric) technique with pressure discrimination of +/- 0.01 bar, achieved by coupling a dead-weight gauge to the cell pressure transducer. The pressure, phase compositions, and molar volumes of the two liquid phases of the ternary LLV system are reported at 295.15 K. Also presented are LLV phase equilibrium data for the binary mixture ethane + methanol. The ternary system has two constituent binary mixtures that exhibit LLV partial miscibility. The portion of the three-phase region of the ternary system examined is bounded by these binary LLV loci and from above by an upper critical end point (L-L = V) locus and from below by a lower critical end point (L = L-V) locus.