(413f) Membrane Separation of Ethanol From Bio-Ethanol Containing Gasoline

Authors: 
Ueda, Y., Seikei University
Takahashi, N., Seikei University
Sakai, Y., Seikei University
Satokawa, S., Seikei University
Iizuka, A., Tohoku University


Polymeric membranes for enriching ethanol from bio-ethanol containing gasoline (BEG) have been developed for the on-board separation process. Poly (vinyl alcohol) (PVA)-base membranes with controlled hydrophilicity were prepared and their separation performances were examined based on the pervaporation experimental studies. The hydrophilicity of the PVA-based membranes was controlled by changing the degree of saponification (the fraction of hydroxyl groups). The PVA-based membranes showed high selectivity for ethanol, of which the concentration in the permeate side was higher than 90% for a wide range of the feed composition studied. Increasing the hydrophilicity of the membranes increased the ethanol selectivity over a model hydrocarbon (n-heptane), and the flux decreased. The highest flux observed was as high as 100 g/m2/h. The results suggest that the membranes can be applicable for the separation processes of ethanol from BEG.
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