关键词: 超声, 超临界CO₂萃取, 丁香, 肉桂, 挥发油, 合提, 分提

Abstract:

The optimal parameters for the ultrasound-assisted supercritical CO₂ extraction （USCE） of volatile oil from the compound recipe of clove and cinnamon were determined by orthogonal experiments, and the corresponding dynamic models were established based on the model equation deduced from the differential mass balance and Fick＇s first law. By analyzing the dynamic models of USCE and supercritical CO₂ extraction （SCE） , the enhancement effect of ultrasonic on SCE was revealed. Moreover, by means of GC-MS and GC analyses, the yields of the volatile oil respectively with simultaneous and individual extractions were compared. The results show that, in the optimal conditions, namely an extraction pressure of 25MPa, an extraction time of 4. 0h, a CO₂ flowrate of 3. 0L/h and an ultrasonic power density of 60 W/L, the yield of the volatile oil reaches 11.60% , thus revealing the enhancement of SCE by ultrasonic. It is also found that the yield of volatile oil from the compound recipe of clove and cinnamon is greater than the sum of the yields of individual extractions of clove and cinnamon.

Key words: ultrasonic, supercritical CO₂ extraction, clove, cinnamon, volatile oil, simultaneous extraction, individual extraction