membrane separation technology

• After the bacterial fermentation to ethanol, the ethanol must be separated out of the solution mixture and converted into a fuel-grade ethanol at 99+% purity.
• As syngas fermentation leads to lower ethanol concentrations than corn fermentations, the energy and cost to separate the ethanol from water is proportionally higher. To reduce this differential, Coskata has exclusively licensed membrane separation technology to reduce the energy requirements by over 50%.
• The vapor permeation process is amenable to separating ethanol from biofermentation broth because of the very low solids content of the broth relative to other fermentation processes.

http://www.coskata.com/ProcessSeparations.asp