Phase Behavior and Critical Phenomena in Fluid Mixtures under Pressure

Abstract

Three different types of two‐phase equilibria have to be considered in fluid mixtures: liquid‐gas, liquid‐liquid, and gas‐gas equilibria. The pressure dependence and critical phenomena of these kinds of phase equilibria will be shortly reviewed and recent data will be presented: since mainly high‐pressure work, say above 300 bar up to several kbar, will be discussed, liquid‐liquid and gas‐gas equilibria in particular will be considered.New developments during recent years have shown that the limits between these three forms of phase equilibrium in fluid mixtures are not well defined at high temperatures and pressures and that continuous transitions between all these types occur. This continuity will be demonstrated for binary mixtures of hydrocarbons with CO2 and H2O.

High-pressure electrochemistry: a new frontier in decarbonization

“…26 Several studies have been reported in the literature that estimate the pressure dependence of these properties. [27][28][29][30][31] For example, a theoretical study by Guan et al 32 predicts that metal superhydrides can be synthesized at high pressures simultaneously with an applied bias (known as the pressure-potential approach). Such a method extends the thermodynamic stability regime of super hydrides, which are challenging to form at ambient pressures.…”