本研究是利用滲透蒸發(PV)與薄膜蒸餾(MD)兩種薄膜系統去除廢棄切削油溶液中多餘的水分使其含水率降到5 wt%以下而能回收再利用。
廢棄切削油溶液先經過NMR、TGA與Karl Fischer水分分析儀鑑定其性質並確定主成分為二乙二醇(DEG)且為多成分的混合物。PV部分先做薄膜篩選並確定所使用的薄膜為PVA/PAN且以馬來酸酐交聯的複合膜，之後在溫度探討中確定最佳操作溫度為85°C，最後做實廠廢棄切削油測試，其結果與85°C的模擬廢水相似，進料端含水率Xwater可降到0.58 wt.%。
本實驗使用的MD系統為真空式MD(VMD)在經過溫度、攪拌轉速與滲透端壓力的探討後得到最佳操作條件為90°C、1500 rpm及45 Torr，此時Xwater為2.3 wt.%。對於最佳條件下的第一個樣品而言，VMD的滲透液流通量與分離係數分別比PV的大約20倍與50倍。VMD只需40分鐘即達平衡，然而PV最終的Xwater比MD的小，因此在去除廢棄切削油的水分方面應該先用VMD處理後再交給PV處理。

This study is using pervaporation (PV) and membrane distillation (MD) to dehydrate the spent cutting oil and make it recycled (water content ≦ 5 wt%). The spent cutting oil is analyzed by NMR, TGA and Karl Fischer titrator and is obtained that diethylene glycol (DEG) is the major component and the spent cutting oil is a multicomponent mixture. In PV experiment, the polyvinyl alcohol (PVA)/polyacrylonitrile (PAN) hybrid membrane crosslinked by maleic anhydride is chosen. After the temperature experiment, 85°C is chosen as the optimal temperature. The results of the real spent cutting oil experiment are almost the same as the same as that in the synthetic spent cutting oil experiment at 85°C and the final water content in the feed solution (Xwater) is 0.58 wt.%. The MD system used in this study is vacumm MD (VMD). The effects of temperature, stirring rate and pressure of permeate are studied and the optimal operating condition is 90°C, 1500 rpm and 45 Torr. The final Xwater is 2.3 wt.% at the optimal operating condition. For the first sample at the optimal condition, the flux and separation factor of VMD are larger than those of PV about 20 times and 50 times. It only costs 40 minutes making VMD system become stable. However the final Xwater of PV is lower than that of VMD. Therefore, it is better that the spent cutting oil is treated by PV after treated by VMD.

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