荆条叶精油的CO_2超临界流体萃取工艺研究

Technology of Extraction of Essential Oil from Leaves of Vitex negundo L.var.heterophylla(Franch.) Rehd. by Supercritical CO_2 Apparatus

通过单因素试验及正交试验,考察了萃取压力、萃取温度、萃取时间、CO2流量等因素对荆条叶油萃取率的影响,确定了CO2超临界流体萃取荆条叶油的最佳工艺条件:萃取压力22MPa,萃取温度45℃,CO2流量25L/h,萃取时间3h,荆条叶油萃取率3·22%。

By the designation of mono-factor experiments and orthogonal muhifactor experiments, influences of extraction temperature, extraction pressure, CO2. flow rate and extraction times on the yield of oil from the leaves of Vitex negundo L. var. heterophyUa （Franeh.） Rehd. in the supereritieal CO2 extraction process were investigated. The obtained optimal extraction technology was： the extraction pressure： 22 MPa; the extraction temperature： 45℃ the CO2. flow rate： 25 L/h and the extraction time： 3h. The oil yield on the above supereritieal CO2 extraction conditions was 3.22%.