It refers to the compressible, high-density carbon dioxide fluid in contact with the separated substance at a state above the critical temperature and pressure, and the substance in the supercritical fluid due to its solubility. , which is greatly affected by pressure and temperature, and can selectively extract components of polarity, boiling point and relative molecular weight in order to achieve the purpose of separation and extraction. Supercritical carbon dioxide extraction method has the advantages of high extraction rate, no residual solvent toxicity, natural active components and heat-sensitive components are not easy to decompose and destroy, can maximize the natural characteristics of the extract, and can achieve selective separation and many other advantages.

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