本文主要在於探討超臨界流體萃取之動力學, 並量測了超臨界相質傳係數
。本研究所採用系統為二氧化碳、乙醇、水, 實驗在體積為一升的高壓攪
拌槽中進行, 以半批式操作方式, 在不同操作條件下, 壓力100 bar
至150bar, 攪拌速度8.33Hz至16.7Hz和流速5.36x10m/s至1.25x10 m/s,以
探討不同操作條件對超臨界流體萃取效率的影響。由實驗結果顯示, 萃取
效率隨壓力和流速的增加而遞增, 萃取效率在低流速下隨著攪拌速率的增
加而遞增, 但在高流速下攪拌速率的增加對萃取效率影嚮並不顯著。在實
驗結束後收集中瓶的濃度約為萃取槽起始濃度的3 至5倍 , 即約30wt%
至50wt%。

The objective of this paper is to determine the volumetric
mass transfer coefficient in a stirred supercritical fluid
extractor. Experiments were conducted in the extractor by a
semibatch method. The liquid-supercritical fluid systems
utilized in this study consisted of ethanol / water / carbon
dioxide. The effects of operating parameters(temperature 50C,
pressure 100 bar-150 bar, superficial velocity 5.36x10 m/s-
1.25x10m/s and mixing speed 8.33 Hz-15.0 Hz) on the efficiency
of extraction were investigated. The results showed that
the efficiency of extraction increased with superficial
velocity and pressure. The efficieny of extraction increased
with mixing speed at low superficial velocity, but was not
affected significantly by mixing speed at higher superficial
velocity. The concentration of ethanol recovered in the
collector was three to five times higher than the
initial concentration of ethanol charged into the extractor.