薄膜蒸餾應用於酒精純化之研究

Purification of Ethanol by Using Membrane Distillation

本研究利用空氣式薄膜蒸餾法（AGMD）應用於酒精發酵系統中之乙醇分離及純化，探討AGMD所適用的ePTFE膜材、操作溫度、進料流速對於通量及乙醇選擇性的影響。本研究以厚度0.02mm之PTFE加不織布膜對10wt%及25wt%乙醇水溶液作測試，研究結果顯示薄膜蒸餾可分離並純化乙醇水溶液，經過兩階段薄膜蒸餾分離純化後濃度可由10%提升至5048%。AGMD的操作溫度會影響所得到的通量以及乙醇的選擇性，通量與選擇性會隨著溫度差增加而提高。進料端流速亦會影響到AGMD的通量，隨著進料流速增加而提高。

A high flux of AGMD membrane and ethanol separated from the reaction mixtures can be obtained in this program. We aim to concentrate and purify ethanol through the membranes from simulate fermentation system, and establish a continuous MD system for separate and purify bioethanol from fermentor.Experimental results show that, via two-stage AGMD separated and purification 10wt% alcohol solution increase to 50.48%. Moreover, feed temperature and velocity enhanced flux, and temperature different will increase both of flux and selectivity of alcohol.