關於平板薄膜透析操作之質傳問題在理論上可以類比於平板式熱交換器的熱傳方式。而本實驗是以纖維酯為材質的薄膜做為阻隔膜將尿素由單行程裝置水溶液端透析到薄膜的另一端，而理論的預測值與實驗的結果相當吻合。本文主要探討回流裝置的加入對於平板式薄膜透析系統的改善情形，研究結果發現，回流裝置確實能夠提高平板式薄膜透析器之效率，由實驗結果得知，在較高的尿素水溶液入口濃度、較大的回流比或是較高的水溶液(透析相)的體積流率的操作方式下對質量傳送的效果越好。 The mass transfer for membrane dialysis through a flat-plate module has been studied theoretically with or without the external reflux, which is analogous to the heat transfer in a flat-plate heat exchanger. Experiments were carried out by using the membrane sheet made of cellulose ester as a permeable barrier to dialyze urea from the aqueous solution. Theoretical predictions are in good agreement with the experimental results. In contrast to the device without recycle, considerable improvement in mass transfer is obtainable, if the membrane dialysis is operated with recycle. The recycle can enhance mass transfer, especially for operations with higher volumetric flow rate, higher inlet urea concentration or reflux ratio.
