超临界流体萃取强化技术及应用

超临界流体萃取技术是近代分离技术中出现的最新学科 ,由于其和传统萃取方法相比具有很多优势 ,近年来发展迅速。但其本身也存在着一些问题如操作压力大、萃取时间较长 ,对设备的要求高 ,能耗相对也大 ,提取能力小 ,萃取率有待进一步提高 ,从而限制了其应用领域的进一步拓展和大范围地转化为工业化生产。采用夹带剂、超声场或电场等技术强化超临界流体萃取过程 ,可有效地提高萃取率 ,降低操作压力等 ,因而成为人们研究的一个新动向 ,也将对超临界流体萃取技术产生重要的影响。对这些强化技术及应用进行论述 ,并提出了所存在的问题和研究方向

Techniques of Enhancing Supercritical Fluid Extraction and Their Applications

Supercritical fluid extraction(SFE) is a new subject of separation techniques and develops rapidly in recent years because of its advantages over conventional extraction methods.However,there are still some problems unsolved with it,such as high operation pressure,long extraction time,relatively low extraction yield etc.,so that it can not be used widely at factory scale.Since modifier,ultrasonic filed,electrical field etc. can enhance SFE process and be used to solve the problems mentioned above,they become a new orientation of research on SFE.In this article,these enhancing techniques and their application are presented,and the existing problems and research orientation are also pointed out.