The supercritical units select the CO2 medium as the supercritical extraction agent, which makes it have the following characteristics: Wide operating range, easy to adjust Good selectivity, and through controlling the pressure and temperature, targeted extraction of the required ingredients Low operation temperature, the extraction is carried out at a temperature close to room temperature, which is particularly suitable for heat-sensitive components. The extraction process eliminates the possibility of oxidative and photoresponsive reactions, and the extract retains the natural flavor. Only one step from extraction to separation, the CO2 after extraction will not remain in the extracts CO2 is non-toxic, tasteless, non-flammable and easy to get and reused Fast extraction speed In recent years, supercritical extraction technology has got rapid development home and abroad, has realized the industrialized production in hops, spices, herbs, oils, petrochemicals, food health, and other areas.