Phase equilibria in binary and higher systems methanol + hydrocarbon(s): Part I. Experimental determination of liquid-liquid equilibrium data and their representation using the NRTL equation

Abstract Hradetzky, G. and Lempe, D.A., 1991. Phase equilibria in binary and higher systems methanol + hydrocarbon(s). Part I. Experimental determination of liquid-liquid equilibrium data and their representation using the NRTL equation. Fluid Phase Equilibria, 69: 285-301. New measurements of the liquid-liquid equilibrium were carried out in the binary system methanol + hexane in the temperature range from 293 K up to the critical solution temperature, and in the ternary system methanol + hexane + cyclohexane in the temperature range 293–313 K. A double-plait point appearing in the ternary system could be determined exactly with the help of a special ampoule technique. This system shows a remarkably strong temperature dependence of the LLE. The LLE data were correlated using the NRTL equation with temperature-dependent parameters. Reliable results were obtained for the LLE data of the binary and ternary systems. Systematic deviations arise if the modelling of the VLE data is additionally included.