本篇論文研究利用半流動式超臨界二氧化碳流體設備，進行薰衣草精油的萃取。對於萃取產率的影響來自於不同的實驗參數，其中實驗設計參數包含溫度為308.15 K、313.15 K、318.15 K，壓力為130 bar、150 bar、170 bar，二氧化碳流率為3.6 L/hr、6.0 L/hr、8.4 L/hr，進行實驗。將實驗所得的數據利用實驗設計法中二階多項式模型分析各參數間與其交互作用的關係。
從實驗結果可知，超臨界二氧化碳流體在萃取過程中具備相當優秀的萃取能力，但容易受參數變化的影響。在本研究所進行的實驗範圍內，最佳的實驗萃取產率為6.20 Wt%，其實驗條件為壓力150 bar，溫度308.15 K，流率8.4 L/hr。因此可得知超臨界二氧化碳可使用於薰衣草精油萃取的製程上。
In this study, semi-mobile type apparatus was used to extract lavender essential oil in supercritical carbon dioxide fluid. The effect on the extracting yield performance of different parameters including temperature (308.15 K, 313.15 K, 318.15 K); pressure (130 bar, 150 bar, 170 bar); flow rate of CO2 (3.6 L/h, 6.0 L/h, 8.4 L/h) was examined, using the fractional factorial design of experiments. Based on the experimental data, a second order polynomial model was established to analyse the interaction between variables.
The experimental results indicated that supercritical carbon dioxide fluid was excellent at yield during the extracting process, but it was easily affected by variations of parameters. In the tested range of this study, the maximum experiment data of extracting yield was 6.20 Wt%, under the pressure 150 bar, temperature 308.15 K and flow rate 8.4 L/h. Therefore, it is concluded that supercritical carbon dioxide can be used in the process for extracting essential oil of used lavender.
