Density Considerations
Thermodynamic Properties
Diffusivity/Viscosity Considerations
Transport Properties
Biological Properties
Solvating Strength
General Process Concepts
Modified Supercritical Fluids




The SCF transport properties are very attractive as they are dense as liquids but “mobile” like gas (very low viscosity, intermediate diffusivity), as shown on table 1. So, mass transfer (and similarly heat transfer) is fast in SCF in comparison with liquid solvents or water. Moreover, SCF rapidly diffuse in porous media, easing either extraction from solid materials or impregnation of solutes into porous media.

 

Table 1: Comparison of average properties of gases, liquids and SCF

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