Gevo, a privately held renewable chemicals and advanced biofuels company, has successfully produced isobutanol from fermentable sugars derived from cellulosic biomass. The company also successfully converted the cellulosic isobutanol into isobutylene and paraffinic kerosene (jet fuel).
Follow this link to learn more: http://www.greencarcongress.com/2010/07/gevo-produces-isobutanol-hydrocarbons-and-renewable-jet-fuel-from-cellulosic-biomassgevo-20100729.html