鈉型離子交換薄膜之製備與滲透蒸發之研究

Sodium Ion Exchanged Membrane for Pervaporation Application

本研究之目的在於以氫氧化鈉作為鈉離子來源，製備鈉離子化交換薄膜以提升高分子膜之滲透蒸發分離性能。研究中鈉離子化交換薄膜之滲透蒸發性能強烈受鈉離子含量與取代程度之影響，當離子含量低時，離子交換膜選擇性高達1000以上且透過率與未取代高分子薄膜相當，鈉離子取代度提高則其薄膜之膨潤度增大，離子交換膜選擇性降低，研究中亦顯示薄膜中溶質吸附組成與鈉離子取代程度關係不大。研究中亦發現高溫與低乙醇濃度操作條件下薄膜之選擇性具良好選擇性。由本實驗之結果發現鈉離子化交換膜能有效提升高分子膜之滲透蒸發性能，且於低乙醇與高溫操作下分離性能良好。

The purpose of this study focused on the preparation of sodium ion exchanged membranes and their application on pervaporation. The separation performance of ion exchanged membranes was strongly influenced by the sodium ion content in membranes and degree of substitution of ion in membranes. The separations of ion exchanged membranes own the separation factor above 1000 while the lower ion content in membranes. The increase in the degree of swelling was contributed by the ion hydration of sodium and ethanol swelling in feed solution. The swelling properties decreased the permselectivity og ion exchanged membranes. The permeate content shows the less independent on the degree of ion substitution. In this study, the low ethanol concentration and high operating temperature benefited the permselectivity and permeation. The results showed that the sodium ion exchanged membranes enriched the membranes separation performances and the low ethanol concentration and lowing temperature operation lead to a good separation performance.