What is supercritical fluid extraction method?

Supercritical fluid extraction (SFE) is the process of separating one component (the extractant) from another (the matrix) using supercritical fluids as the extracting solvent. Extraction is usually from a solid matrix, but can also be from liquids.

What are the applications of supercritical fluid?

Supercritical fluids have been applied to mass-transfer processes, phase-transition processes, reactive systems, materials-related processes, and nanostructured materials. Some applications are already at industrial capacity, whereas others remain under development.

What are the advantages of supercritical fluid?

The major advantages of preparative supercritical fluid chromatography (SFC) include separation speed; the ability to achieve chiral separations; lower viscosity of the mobile phases, which allows high flow rates with acceptable pressure drops and results in higher productivity; reduction of solvent use of as much as …

What are the advantages of supercritical fluid extraction?

Solvent Extraction Supercritical-fluid extraction has the advantage that slight changes in temperature and pressure within the critical region give extremely large changes in solvent density and solubility.

What is the most commonly used supercritical fluid extraction?

Supercritical fluid extraction Carbon dioxide is the most common supercritical solvent. It is used on a large scale for the decaffeination of green coffee beans, the extraction of hops for beer production, and the production of essential oils and pharmaceutical products from plants.

What is meant by supercritical fluid?

A supercritical fluid (SCF) is a material that can be either liquid or gas, used in a state above the critical temperature and critical pressure where gases and liquids can coexist.

Why is it called supercritical fluid?

A supercritical fluid (SCF) is any substance at a temperature and pressure above its critical point, where distinct liquid and gas phases do not exist, but below the pressure required to compress it into a solid.

What is the most common solvent used in industry for supercritical fluid extraction?

Carbon dioxide (CO2)
Carbon dioxide (CO2) in its supercritical fluid state (scCO2) is distinguished as the most commonly used SCF solvent for several reasons: it is readily available, it is a reusable gas, and it has a low critical temperature (Tc) of 31.1 °C and relatively low critical pressure (Pc) of 72.8 bar.

What are the disadvantages of supercritical fluid extraction?

flowers. Although the main disadvantage of supercritical carbon dioxide extraction is the expensive equipment and the analysis pr°Cess, the possibility of using a lower temperature during extraction avoids thermal degradation of the labile compounds and makes this method attractive.

What are the properties of a supercritical fluid?

A supercritical fluid is a substance with both gas-and liquid-like properties. It is gas-like in that it is a compressible fluid that fills its container, and is liquid-like in that it has comparable densities (0.1–1 g ml-1) and solvating power.

What are the benefits of using supercritical fluids in EGS?

Recent studies have demonstrated that wells that tap supercritical fluids could have much higher productivities due to the high fluid enthalpies, which could make deeper and hotter wells economically attractive (e.g., Friðleifsson et al. 2007).