Abstract
The separation by pervaporation of ethanol/water mixtures was investigated. Plasma polymerization was used to produce membranes. Ethanol-permselective membranes can be prepared from various silicone and silane monomers under extremely mild polymerization conditions. These membranes have polydimethylsiloxane-like structures and selectivity factors of 1.5~5.2. Further investigations were carried out on the mechanism of permeation through plasma-treated silicone rubber membranes and silicone oil membranes. Highly permselective membranes can be prepared by surface treatment of thin polydimethylsiloxane membranes with silane compounds containing octadecyl groups. An ethanol permselectivity, α EtOH, of 18.0 and a flux of 0.015 kg/cm 2-hr were obtained with these membranes. This report gives a novel method for producing ethanol-permselective membranes.
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