Supercritical fluid extraction technology is a new separation technology developed in recent years. The working principle of supercritical fluid extraction technology is to control the supercritical fluid to extract components from the target under the condition of exceeding the critical temperature and pressure. When it returns to normal pressure and normal temperature, the components dissolved in the supercritical fluid are separated from the supercritical fluid. At present, carbon dioxide is widely used as supercritical extraction solution.

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