Phase Diagrams for Supercritical Fluid-Solute Mixtures

Before describing the features of the phase diagrams, it is instructive to 

Degrees of freedom = number of components + 2 - number of phases. (3.1) 

Although nature provides us with countless numbers of possible binary phase diagrams, Scott and van Konynenburg show that virtually all of the experimentally observed phase behavior can be represented with five schematic P-T diagrams (Scott, 1972 Scott and van Konynenburg, 1970). Streett (1983) 

One-component System Two-component System Degrees of Freedom  

Temperature at which two liquids critically merge to form a single liquid phase as the system temperature is raised the UCST is at a lower temperature than the LCST. 

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Phase Diagrams for Supercritical Fluid-Solute Mixtures... 

Phase Diagrams for Supercritical Fluid-Solute Mixtures Table 3.2 Definitions of Phase Transitions Occurring at High Pressures... 

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