低温亚临界生物萃取技术是祁鲲于1989年原创发明，曾获得国家技术发明二等奖，获得省部级科技成果二等奖4项，曾列入国家“火炬计划”“科技先导计划”“科技示范计划”，目前已广泛应用于植物油、植物精油、植物蛋白、植物色素、精细化工、中药提取等多行业，已建成生产线80余条，是超临界CO2技术后的创新性成果。低温亚临界萃取装备是多用途的通用的半永久的加工平台。
Low temperature subcritical biological extraction technology is originally invented by Qi Kun in 1989， once won the second prize of national technological innovation and 4 items granted the second prize of scientific and technological achievements， once listed in national “Torch Plan” “Science and technology pilot program” and “Science and technology demonstration project”. Now it is widely applied in plant oils， plant essential oils， plant protein， plant pigments， fine chemical engineering and Chinese medicine extraction ， etc. More than 80 production lines have been set up， it is the supercritical CO2 technology innovative achievements. Low temperature subcritical extraction equipment is multi-purpose generic semi-permanent processing platform .
技术原理：低温亚临界萃取溶剂主要有液化丙烷、丁烷、甲醚、四氟乙烷、液氨，由于萃取温度在溶剂的沸点温度以上及临界温度以下这个温度区间，而且，5种亚临界溶剂沸点均在0℃以下，所以我们定义为低温亚临界萃取；萃取原理为相似相溶原理，萃取工艺为逆流萃取，萃取压力在0.3MPa～1.0MPa之间，萃取及脱溶温度为环境温度；萃取溶剂采用压缩回收，循环使用。
Technical principle： Main solvents for low temperature subcritical extraction are liquid propane， butane， dimethyl ether， R134a and liquid ammonia. It is because the extraction temperature is above the boiling point of the solvent but under the critical temperature， and these 5 subcritical solvents’ boiling point are all below 0℃ that we define it low temperature subcritical extraction； The extraction principle is similarity-intermiscibility theory， the technology is countercurrent extraction， the pressure is between 0.3MPa～1.0MPa， the temperature for extraction and desolvation is environment temperature， the solvent is adopted compression recovery and recycling .
技术优点：①在室温下完成物料的萃取和脱溶，油和粕中的热敏性成分不会热变性，对蛋白类、色素类、药材类、挥发性精油类产品实现了保质提取分离；②溶剂消耗少，每加工1吨原料耗溶剂8Kg以下；③节能，相对于常规的己烷萃取，节约热能70%；④相对于CO2超临界萃取投资小、生产成本低、生产规模大。
Technical advantages： ①Complete materials extraction and desolventizing at room temperature， the heat-sensitive components in oils and meals would not thermotropy， achieving the quality of extraction and separation for protein， pigment， medicinal herbs and volatile oil products； ②Less solvent consumption， per ton of raw material consumes solvent below 8 kg； ③Energy conservation， relative to the conventional hexane extraction， heat energy saving of 70%； ④Comparing to the supercritical CO2 extraction， it is small investment， low production cost and big production scale.