The supercritical extraction device is the most advanced physical extraction technology in the world, called SFE (supercritical fluid extraction). At low temperature, increasing the pressure of the gas, the gas will be converted into liquid, when the pressure increases, the liquid volume increases, there is a critical temperature for a specific substance (Tc) and critical pressure (Pc), higher than the critical temperature and pressure, the material will become liquid or the gas, which is the critical point. In the range above the critical point, the state of matter is between the gas and the liquid, and the fluid within this range becomes a supercritical fluid (SF). Supercritical fluid has similar gas permeability and liquid density and solubility, and has good solvent characteristics. It can be used as solvent for extraction and separation of monomers.
Supercritical fluid extraction is a new technology emerging in modern separation. SFE combines traditional distillation and organic solvent extraction, and uses supercritical CO2 excellent solvent force to separate, extract and purify matrix and extract effectively. SFE uses supercritical CO2 to extract the material. CO2 is safe, non-toxic, cheap liquid, solvent diffusion coefficient, supercritical liquid gas like CO2, the surface tension is zero, can rapidly penetrate into the solid material, extract its essence, has the advantages of high efficiency, easy oxidation, pure natural, no chemical pollution etc..
The technology of supercritical fluid extraction and separation is closely related to the solubility of supercritical fluid and its density. The density of supercritical fluid is greatly changed by changing the pressure or temperature. In supercritical state, the supercritical fluid is contacted with the substance to be separated, so that it selectively extracts the components with different polarity, boiling point and relative molecular mass.
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