Sub And Supercritical Fluids
A pure compound can be observed in various phases depending on the temperature and pressure. When a compound is above its boiling point and below critical point under pressure, it is called subcritical fluid. Above the critical point, it is called a supercritical fluid. Fluids at the sub-and supercritical conditions have different physical and chemical properties (e.g., density, dielectric constant, etc.) when compared to their properties at ambient conditions. Some of the commonly used sub-and supercritical fluids are carbon dioxide, water, ethanol, toluene, etc. By changing the temperature and pressure, the improved thermodynamic properties of sub-and supercritical fluids are being used to upgrade biowastes, plastic wastes, biocrude, etc.
Reza Research Group of the Chemical Engineering Program at Florida Tech have several ongoing research projects on upgradation of wastes into values by using the sub-and supercritical properties of various fluids.