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NAMS 2002 Workshop - ICOM 2008

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Pervaporation and Vapor Permeation I – 2<br />

Tuesday July 15, 9:30 AM-10:00 AM, Honolulu/Kahuku<br />

Dewatering Ethanol with Chemically and Thermally Resistant<br />

Perfluoropolymer Membranes<br />

S. Majumdar (Speaker), Compact Membrane Systems, Inc., Newport, DE, USA,<br />

smajumdar@compactmembrane.com<br />

D. Stookey, Compact Membrane Systems, Inc., Newport, DE, USA<br />

S. Nemser, Compact Membrane Systems, Inc., Newport, DE, USA<br />

Bio-based ethanol is a renewable energy source. Ethanol from agricultural<br />

sources has many potential advantages including development of fuel<br />

independence and reduction in greenhouse gas generation. However, the energy<br />

costs associated with converting fermentation ethanol to dry fuel grade ethanol<br />

are substantial. Ethanol as derived through fermentation from biomass contains a<br />

significant amount of water. Dehydration is an essential process step that is<br />

complicated by the ethanol-water azeotrope.<br />

CMS is currently investigating highly permeable, chemically and thermally<br />

resistant perfluoropolymer membranes to selectively remove water from waterethanol<br />

mixtures. These membranes are hydrophobic and organophobic and yet<br />

have high water vapor permeation flux. Basic data in combination with<br />

preliminary economic and engineering analysis show that a process scheme that<br />

includes CMS membranes can improve the overall economics for dewatering and<br />

producing fuel-grade ethanol. This presentation discusses the application of this<br />

novel perfluoropolymer membrane-based technology for the production of fuelgrade<br />

ethanol.

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