Key words: supercritical fluids, supercritical phenomena in ternary systems, stable and metastable regions of immiscibility
Some features of phase equilibria in ternary systems with one volatile component and with a region of homogeneous supercritical fluid (SCF) in one of binary sub-systems (with two critical end-points p and Q) are analyzed. It is demonstrated that heterogenization of SCF that is spreading into a ternary system from the boundary binary sub-system of 2d' type starts from monovariant critical phenomena in saturated solutions (liquid1 = liquid2 - solid) or (gas = liquid - solid), which pass through extremal parameters (temperature, composition) and form such special critical equilibria as double critical end-point (liquid1 = liquid2 - solid, gas = liquid - solid, liquid1 = liquid2 - gas) or double homogeneous points (liquid1 = liquid2 - solid о gas = liquid - solid). Ternary nonvariant points (liquid1 = liquid2 = gas, liquid1 = liquid2 - gas - solid and liquid1 = gas - liquid2 - solid) appear at the cross-sections of monovariant critical and non-critical curves.
doi:10.1134/S1990793110070134