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超临界流体是指处于临界温度和临界压力之上的流体。它具有类似于气体的低粘度和类似于液体的高密度，有较好的流动、传质、传热和溶解性能。超临界流体对状态参数的改变十分敏感，温度和压力较小的变化就会使流体的性质发生较大的改变。适当地应用超临界流体技术可以有效地减
A supercritical fluid refers to a fluid that is above a critical temperature and critical pressure. It has a low viscosity similar to gas and a high density similar to liquid, with better flow, mass transfer, heat transfer and dissolution properties. The supercritical fluid is very sensitive to the change of the state parameter, and the small change of temperature and pressure will change the properties of the fluid greatly. Appropriate application of supercritical fluid technology can effectively reduce