超临界流体CO2提取小桐子油

Jatropha Oil Extraction by Supercritical Fluid Carbon Dioxide

本文探讨了在小桐子油提取过程中超临界流体CO2提取温度、压力和CO2流量对小桐子出油率的影响，并与超声波提取、索氏提取和低温压榨方法提取小桐子油的理化性质相比较。研究结果表明：索氏提取小桐子油出油率最低为29．1％，超临界流体CO2提取小桐子油出油率最高达37．9％；低温压榨小桐子油酸值和过氧化值最高，分别为10．45mgKOH／g和9．21meq／Kg，超临界流体CO2提取小桐子油酸值和过氧化值最低，分别为0．72mgKOH／g和3．21meq／Kg；超临界流体CO2提取的小桐子油达到优质精炼油水平，无需对小桐子油预处理，可直接酯交换反应制备生物柴油，显著降低小桐子油制备生物柴油的生产成本。

The influence of the oil extraction yields were investigated with different supercritical fluid extraction temperatures,pressures and flow rates. The comparison of physicochemical properties of Jatropha oil extracted by supercritical fluid, ultrasonic, Soxtflet and squeeze were also studied. The results showed that the yield of supercritical fluid was up to 37.9%, compared to the lowest yield 29.1% by Soxhlet extraction. The acid value and peroxide value of Jatropha oil extracted by squeeze were highest,10.45 mg KOH/g and 9.21 meq/Kg, respectively. Compared to supercritical fluid extraction, however, those were lowest, only 0.72 mg KOH/g and 3.21 meq/Kg, respectively. The properties of Jatropha oil extracted by supercritical fluid reach the standard of high quality refined oil. Used this Jatropha oil as feedstock, it can produce biodiesel direcdy without any pretreatment, so it can dramatically reduce the cost of biodiesel production.