The basic principle of supercritical extraction device
Release Date:
2021-04-09
The supercritical extraction device is an internationally advanced physical extraction technology, referred to as SFE. At lower temperatures, when the pressure of the gas is continuously increased, the gas will be transformed into a liquid. When the pressure increases, the volume of the liquid increases. For a particular substance, there is always a critical temperature (Tc) and a critical pressure ( Pc). Above the critical temperature and critical pressure, the substance will not become liquid or gas. This point is the critical point.
The supercritical extraction device is an internationally advanced physical extraction technology, referred to as SFE. At lower temperatures, when the pressure of the gas is continuously increased, the gas will be transformed into a liquid. When the pressure increases, the volume of the liquid increases. For a particular substance, there is always a critical temperature (Tc) and a critical pressure ( Pc). Above the critical temperature and critical pressure, the substance will not become liquid or gas. This point is the critical point.
"In the range above the critical point, the state of matter is between gas and liquid, and the fluid within this range becomes supercritical fluid (SF). Supercritical fluid has a strong penetrating power similar to a gas and a larger density and solubility similar to a liquid. It has good solvent characteristics and can be used as a solvent for extraction and separation of monomers.
Supercritical fluid extraction is a high-tech emerging in modern separation. SFE combines traditional distillation and organic solvent extraction, and uses the excellent solvent power of supercritical CO2 to effectively separate, extract and purify the matrix and extract. SFE uses supercritical CO2 to extract the material.
CO2 is a safe, non-toxic, and cheap liquid. Supercritical CO2 has a diffusion coefficient similar to gas, liquid solubility, and zero surface tension. It can quickly penetrate into solid matter and extract its essence. It has high efficiency, is not easy to oxidize, and Pure natural, no chemical pollution and other characteristics.
Supercritical fluid extraction and separation technology uses the dissolving ability of supercritical fluid to be closely related to its density, and the density of supercritical fluid is greatly changed by changing the pressure or temperature.
In the supercritical state, the supercritical fluid is contacted with the substance to be separated, so that it can selectively extract the components with different polarity, boiling point, and relative molecular mass in sequence.
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