ZZKD is a professional supplier of distillation and extraction equipment, Supercritical extraction equipment is also called as SFE,Supercritical extraction is a new type of extraction and separation technology.Our supercritical equipment supports customization,we will provide reasonable solutions according to your requirment.

Supercritical is a state of matter between gas and liquid that is neither gaseous nor liquid,This substance can only exist when its temperature and pressure exceed the critical point.The density of supercritical matter is higher, similar to that of liquid, and its viscosity is closer to that of gas.Therefore, supercritical material is a very ideal extractant.

The solvent strength of supercritical substances depends on the temperature and pressure of extraction.Using this feature, only by changing the pressure and temperature of the extractant fluid, different components of the extract can be extracted from the fluid successively.The weakly polar substances are first extracted at low pressure. With the increase of pressure, the substances with larger polarity and large molecular weight are subjected to supercritical extraction under the program boost pressure to obtain different extraction components, and at the same time, it can also play a role in separation.
Changes in temperature affect the density and solute of the extractant,In the low temperature zone, the temperature rises to reduce the density of the fluid. Therefore, the temperature rise of the extractant can cause the solute to separate from the fluid extractant. When the temperature further rises to the high temperature zone, although the density of the extractant further decreases, the vapor pressure of the solute increases. The volatility is increased, and the extraction rate will not decrease but has a tendency to increase.

In addition to pressure and temperature, adding a small amount of other solvents to the supercritical substance can also change its ability to dissolve solutes. Usually the amount of solvent added does not exceed 10%, and polar solvents such as methanol and isopropanol are mostly used. Adding a small amount of polar solvent can further expand the scope of application of supercritical extraction technology.

The principle of the supercritical CO2 fluid extraction (SFE) separation process is based on the influence of pressure and temperature on the solubility of supercritical fluids. In the supercritical state, the supercritical fluid is contacted with the substance to be separated to selectively extract the components of polarity, boiling point, and molecular weight in sequence. The extracts obtained in each pressure range cannot be single, but the conditions can be controlled to obtain the best proportion of the mixed components, and then the supercritical fluid can be turned into an ordinary gas by means of decompression and temperature rise, and the extracted substance can be completely or large. Department analysis found that, in order to achieve the purpose of separation and purification, the supercritical CO2 fluid extraction process is a combination of extraction and separation processes.