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Technique of super-critical extraction, a advanced technical coming forth presently, is a new subject in the field of the modern chemical separating industry, which is applied widely in the field of extracting substance from plant.
There is a immediate relationship between dissolvable capability of Super-critical medium and it-selves density. Both pressure and temperature affect the dissolvable capability of Super-critical medium. Under super critical condition, put Super-critical medium together with material needed be separated to extract substance according to polarity magnitude, boiling point, and molecular weight. For substance extracted achieved at some pressures is not simplex, the condition should be controlled to achieve excellent quality of mixed composition, then, reduce pressure, increase temperature, to change the phase of Super-critical medium from liquid to gas. By this way, substance extracted is separated and purified. CO2 Super-critical extraction includes extraction and separation.