The so-called carbon dioxide supercritical extraction is to use the carbon dioxide which has been pressurized into a supercritical state as the solvent, and extract the material which is not easy to extract with its extremely high solubility. The following are several explanations about extraction:

Dissolve the role

For different solute in supercritical state, CO2 dissolving capacity difference is very big, this has to do with the polarity of the solute, the boiling point and molecular weight are closely related, generally has the following pattern: lipotropy, low boiling point components in 104 kpa (about 1 atmospheric pressure) the following extraction, such as naphtha, hydrocarbon, ester, ether, epoxy compound, as well as the aroma components in natural plants and fruits, such as eucalyptus brain, thymol, hop in low boiling point esters, etc.; The more polar groups (e.g., -oh, -cooh, etc.), the more difficult to extract. The components with the molecular weight in the range of 200 ~ 400 are easy to extract. Some of the low molecular weight, volatile components can even be extracted directly with CO2 liquid. High molecular weight substances (such as proteins, gums and waxes) are difficult to extract from carbon dioxide

Supercritical foaming equipment