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Separation technologies for the recovery and dehydration of alcohols from fermentation broths
Biofuels, Bioproducts and Biorefining
Volume 2, Issue 6, Date: November/December 2008, Pages: 553-588
Leland M. Vane

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Review
Separation technologies for the recovery and dehydration of alcohols from fermentation broths
Leland M. Vane, PhD *
US Environmental Protection Agency, Cincinnati, Ohio

email: Leland M. Vane (Vane.Leland@epa.gov)

*Correspondence to Leland M. Vane, National Risk Management Research Laboratory, Office of Research and Development, US Environmental Protection Agency, Cincinnati, Ohio 45268.

This article is a US Government work and is in the public domain in the USA.

Keywords
separation processes • biofuels • energy efficiency • dehydration • ethanol


Abstract
Multi-column distillation followed by molecular sieve adsorption is currently the standard method for producing fuel-grade ethanol from dilute fermentation broths in modern corn-to-ethanol facilities. As the liquid biofuels industry transitions to lignocellulosic feedstocks, expands the end-product portfolio to include other alcohols, and encounters more dilute alcohol concentrations, alternative separation technologies which are more energy efficient than the conventional approach will be in demand. In this review, alcohol recovery technology options and alcohol dehydration technology options for the production of ethanol and 1-butanol are reviewed and compared, with an emphasis on the energy footprint of each approach. Select hybrid technologies are also described. Published in 2008 by John Wiley & Sons, Ltd

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