超临界流体因其表现出的特殊的物质溶解性，且这些特性在临界点附近因温度和压力的微小变化可发生较大的变化，故被用作物质的良溶剂而广泛地应用于萃取、ＲＥＳＳ、ＳＡＳ过程和超临界高分子合成过程中，显示了用以代替传统对环境有害有机溶剂的强大生命力，正日益受到人们重视。 Supercritical fluid because of its special material solubility, and these characteristics in the vicinity of the critical point due to small changes in temperature and pressure can be a greater change, it is used as a good solvent and widely used in the extraction, RESS, SAS process and supercritical polymer synthesis process, has shown that to replace the traditional vitality of harmful organic solvents, is the growing vitality.