Heterogenization of supercritical fluids and nonvariant critical equilibria in ternary systems with one volatile component (for water-salt systems as examples)

摘要

The phase equilibria in ternary systems with one volatile component and a homogeneous supercritical fluid (SCF) region in one of the binary subsystems (with two critical end-points p and Q) were analyzed. Heterogenization of SCFs, extending from the 2d' boundary subsystem into a ternary system, starts with monovariant critical phenomena in saturated solutions (l(1) = l(2)-s) or (g = l-s), which pass through the extremal parameters of the temperature or composition to form special critical equilibria such as double critical end-points DCEs (l(1) = l(2)-s, g = l-s, l(1) = l(2)-g) or double homogeneous points DHPs (l(1) = l(2)-s a dagger" g = l-s). Ternary nonvariant critical points (l(1) = l(2) = g, l(1) = l(2)-g-s, and l(1) = g-l(2)-s) appear at the intersections of the monovariant critical and noncritical curves.