超临界CO_2萃取高原香薷精油工艺研究

目的:研究超临界CO2萃取高原香薷精油的最佳工艺条件.方法:通过正交试验研究萃取压力、温度、萃取时间、CO2流量对萃取率的影响.结果:通过各因素级差大小的比较可知,萃取压力是影响萃取的最主要的因素,其他影响因素依次为萃取温度、CO2流量,萃取时间影响最小.结论:优选出最佳萃取条件为萃取压力30MPa、萃取温度50℃、萃取时间1.5h、CO2流量25kg·h-1.在此条件下的精油收率为2.05%.

Supercritical CO2 Fluid Extraction of Elsholtzia Feddei Benth Essential Oil

Objective To study the optimal conditions for extracting Elsholtzia feddei Benth essential oil with supercritical CO2 fluid. Methods：The influence of extraction pressure, temperature, extraction time and flow rate of CO2 on the extraction rate were discussed by orthogonal experiment. Results： By comparing the grading of these factors, the pressure was the most important factor, extracting temperature was less, flow rate of CO2, and extraction time was the least. Conclusion： The experiments indicate that the optimum extraction pressure, temperature, extraction time, flow rate of CO2 was 30 MPa, 50℃, 1.5 h, 25 kg· h-1, respectively. The yield of SFE - CO2 extracts is 2.05 % under the best conditions.