Fluid Mixtures at High Pressures. Liquid‐Liquid Phase Equilibria and Critical Phenomena in the Systems 1,2,3,4‐Tetrahydronaphthalene + Water, Decahydronaphthalene(cis) + Water, Decahydronaphthalene(trans) + Water, and Methane + Trifluoromethane up to 2600 bar

Abstract

AbstractAs part of an extended research program concerning the phase behaviour and thermodynamics of fluid mixtures at high pressure, the liquid‐liquid phase equilibria in the binary system 1,2,3,4‐tetrahydronaphthalene + H2O, decahydronaphthalene(cis) + H2O, and decahydro‐naphthalene(trans) + H2O as well as in the ternary system 1,2,3,4‐tetrahydronaphthalene + decahydronaphthalene(trans) + H2O were measured in the temperature range from 280°C to 420°C and at pressures up to 2600 bar with an optical high temperature high pressure autoclave using magnetic stirring. All systems show upper solution temperatures that increase with increasing pressure. — The results are compared with data obtained for the liquid‐liquid phase equilibria in the system methane + trifluoromethane at temperatures between — 118°C and — 95°C and at pressures up to 1900 bar in a high pressure low temperature autoclave. This system also exhibits upper solution temperatures that increase with increasing pressure.