Abstract: 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.

Key words: eucommia seed oil, supercritical carbon dioxide extraction, microwave extraction, technology, physics and chemistry index