微波和超临界CO_2萃取杜仲籽油工艺研究

Study on Extraction Technology of Oil from Eucommia Seeds with Microwave and Supercritical CO_2

通过微波萃取和超临界CO2萃取杜仲籽油的正交试验,考察影响萃取效果的主要因素,寻求最佳萃取工艺条件。微波萃取最佳工艺条件为:以环己烷为萃取剂,原料粉碎度40目,溶剂与物料质量比值为5.0,微波功率700W,每次微波辐射时间50s,微波累计辐射8次,在此条件下油脂得率为27.07%。超临界CO2萃取的最佳工艺条件为:萃取压力35MPa、萃取温度45℃、萃取时间70min、分离温度30℃、CO2流量25～30kg/h,原料粉碎度40目,在此条件下油脂得率27.76%。并比较不同提取方法对油脂得率和油脂品质的影响。结果表明,微波萃取所需时间最短,油脂得率较高;超临界CO2萃取所得杜仲籽油的品质最优,是提取优质杜仲籽油的首选方法。

Eucommia seed oil was obtained with SC-CO2 （supercritical CO2） and microwave. The optimum conditions of the microwave extraction were obtained by orthogonal experiment as follows： cyclohexane solvent, the ratio of solvent to material 5.0, the microwave power 700W, radiation time 50s, radiation times 8 and the material particle size 40 mesh. The orthogonal experiment was used to optimize the SC-CO2 extraction conditions, and the optimum conditions were determined： the extraction pressure 35MPa, the extraction temperature 45℃, the separation temperature 30℃, the extraction time 70 min： the material particle size 40 mesh and the CO2 flow rate 25 -30kg/h. The yield of oil obtained by SC-CO2 and microwave is 27.76%and 27.07%, respectively. The yield and quality of eucommia seed oil with different extraction methods were compared. Results show that extraction time of microwave is shorter than SC-CO2, while the quality of eucommia seed oil by SC-CO2 is better than microwave. So the SC-CO2 extraction is better technique of extracting oil from eucommia seed.