Fluid Mixtures at High Pressures Fluid Phase Equilibria in the Systems Fluorobenzene + Water, 1,4‐Difluorobenzene + Water, and 1,2,3,4‐Tetrahydronaphthalene + Decahydronaphthalene(trans) + Water up to 360 MPa

Abstract

AbstractAs part of an extended research program concerning the phase behaviour and thermodynamics of fluid mixtures at high pressures the gas‐gas equilibria of the binary systems fluorobenzene + water and 1,4‐difluorobenzene + water as well as the liquid‐liquid equilibria in the ternary system 1,2,3,4‐tetrahydronaphthalene + decahydronaphthalene(trans) + water were measured in an optical high temperature high pressure cell in the temperature range from 280 to 420°C and at pressures up to 360 MPa. At high pressures all these systems show upper solution temperatures that rise with increasing pressure. – Additionally the critical phase behaviour of nearly all binary water systems investigated up to now is reviewed. The parameters that influence the phase separation in these systems are shortly discussed, and it is shown that the shapes and the relative positions of the steeply ascending branches of the critical p(T) curves mainly depend on the size as well as on the π‐electrons of the molecules of the non‐aqueous component.