本文主要探討薄膜萃取器中質量傳送速率之改良型修正因子分析與效率因子分析。由於薄膜萃取器的質傳理論分析可類比於熱交換器的熱傳理論，因此利用熱交換器之理論基礎為架構來進行質量傳送系統之理論推導。其討論的要點有：單行程、雙行程(A-B)、雙行程(B-A)、三行程(A-B)及三行程(B-A)五種的流動方式，而體積流率，質傳面積，分配係數和整體質量傳送係數等參數，來繪出方便適用的改良型修正因子與效率因子的圖形，因此可以不必使用傳統式修正因子分析中繁雜的疊代法，可以很容易地計算出萃取速率。 理論結果發現：利用改良型修正因子來計算單行程系統的順流和逆流操作時，如選擇適當的平均對數濃度差時，則計算出來的改良型修正因子皆為1。至於交流的部分，也是利用質傳面積、分佈係數和總質量傳送係數，可以繪出改良型修正因子的圖形，可提供查表而輕易地計算出總質量傳送速率。 The expressions of mass-transfer rate for membrane extraction through a rectangular module have been derived under cross-flow operation based on the modified correction-factor analysis and effectiveness-factor analysis coupled with the mass balances. These expressions are explicit and the results can be readily calculated without using try-and-error method, which should be employed in the conventional correction-factor analysis for designing heat and mass exchangers. The modified correction factors in a single-pass parallel-flow device for both cocurrent-flow and countercurrent-flow operations may be taken as unity when the logarithmic-mean concentration differences are properly selected. For cross-flow operation, the modified correction factors are function of flow rate, mass-transfer area, distribution coefficient and overall mass-transfer coefficient, and some values of them are given graphically.
