Global Phase Behavior with Solid and Fluid Phases

Global Phase Behavior with Solid and Fluid Phases 

All of the proposed phase behavior classification schemes describe liquids and gases. However, many of the systems related to reactions in SCFs involve solids, e.g., the reactant and especially the catalyst may be solid. One could imagine the added complexity of inserting solid-phase transitions into just the six types. 

The best studied example of this behavior is that of CO2 and naphthalene (normal melting temperatrue 80.5 °C) [23-27]. Here, naphthalene can melt approximately 20 °C lower than its normal melting point at roughly 15 MPa of CO2 pressure. It is sometimes diflicult to detect transitions from SFE to SLVE and VLE without proper visual verification of phase behavior. This process can aid in reactions, as illustrated by Jessop et al. [28], who discovered that CO2 pressure dramatically increased the 

---