Gas Chromatography Application in Supercritical Fluid Extraction Process

There are two types of application for gas chromatography (GC) in the supercritical fluid extraction process. Gas chromatography is a type of supercritical extraction apparatuses which can separate a component from a multi-component mixture during supercritical extraction. Therefore, this application can be the alternative to conventional gas chromatography, which needs high temperatures for the evaporation of the feed mixture and for liquid chromatography, where liquid solvents may be replaced. This process results in a different transport velocity along the stationary phase for different molecules. Molecules having weak interaction forces with the stationary phase are transported quickly while others with strong interactions are transported slowly. Beside the interactions with the stationary phase, the solvent power of the mobile phase determines the distribution of the components. Furthermore, supercritical gases have a high solvent power and exert this solvent power at low temperatures.