Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
by Staff Writers
Madison WI (SPX) Mar 18, 2014
Using a plant-derived chemical, UW-Madison researchers have developed a process for creating a concentrated stream of sugars that's ripe with possibility for biofuels.
"With the sugar platform, you have possibilities," says Jeremy Luterbacher, a postdoctoral researcher and the paper's lead author. "You've taken fewer forks down the conversion road, which leaves you with more end destinations, such as cellulosic ethanol and drop-in biofuels."
Funded by the National Science Foundation and the U.S. Department of Energy's Great Lakes Bioenergy Research Center (GLBRC), the research team has published its findings in the journal Science, explaining how they use gamma valerolactone, or GVL, to deconstruct plants and produce sugars that can be chemically or biologically upgraded into biofuels. With support from the Wisconsin Alumni Research Foundation (WARF), the team will begin scaling up the process later this year.
Because GVL is created from the plant material, it's both renewable and more affordable than conversion methods requiring expensive chemicals or enzymes. The process also converts 85 to 95 percent of the starting material to sugars that can be fed to yeast for fermentation into ethanol, or chemically upgraded furans to create drop-in biofuels.
To demonstrate the economic viability of this advance, Luterbacher needed to concentrate the sugar, remove the GVL for reuse, and show that yeast could successfully generate ethanol from the sugar stream.
"Showing that removing and recycling GVL can be done easily, with a low-energy separation step, is a little more of an achievement," says Luterbacher. "By feeding the resulting sugar solution to microorganisms, we proved we weren't producing some weird chemical byproducts that would kill the yeast, and that we were taking out enough GVL to make it nontoxic."
"What's neat is that we can use additives to make the solution separate," says Luterbacher. "It becomes like oil and vinegar."
Their additive of choice: liquid carbon dioxide. "It's green, nontoxic and can be removed by simple depressurization once you want GVL and solutions of sugar to mix again. It's the perfect additive," Luterbacher says.
An initial economic assessment of the process has indicated the technology could produce ethanol at a cost savings of roughly 10 percent when compared with current state-of-the-art technologies.
For the past several years, James Dumesic, Steenbock Professor and Michel Boudart Professor of Chemical and Biological Engineering at UW-Madison, and his research group have studied the production of GVL from biomass, and in more recent work they explored the use of GVL as a solvent for the conversion of biomass to furan chemicals.
"The knowledge gained in these previous studies was invaluable to us in the implementation of our new approach to convert real biomass to aqueous solutions of sugars that are suitable for biological conversion," says Dumesic.
This research has contributed new knowledge to the biofuels landscape, resulted in four patent applications, and gained recognition for GVL's commercial potential from WARF's Accelerator Program. The program helps license high potential technologies more rapidly by addressing specific technical hurdles with targeted funding and expert advice from seasoned business mentors in related fields.
Under the Accelerator Program effort, Dumesic will serve as principal investigator for an 18-month project involving construction of a high-efficiency biomass reactor. The reactor will use GVL to produce concentrated streams of high-value sugars and intact lignin solids.
Carbohydrates and lignin from the reactor will be delivered to scientific collaborators, including fellow GLBRC investigators, who will optimize strategies for converting the materials into valuable chemicals and fuels.
"We're excited by the team's scientific achievements and we look forward to supporting the project's next steps through the Accelerator Program," says Leigh Cagan, WARF's chief technology commercialization officer. "If the project successfully achieves the anticipated cost reductions for production of the sugars, lignin and ethanol, we anticipate significant commercial interest in this novel process."
Bio Fuel Technology and Application News
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement All images and articles appearing on Space Media Network have been edited or digitally altered in some way. Any requests to remove copyright material will be acted upon in a timely and appropriate manner. Any attempt to extort money from Space Media Network will be ignored and reported to Australian Law Enforcement Agencies as a potential case of financial fraud involving the use of a telephonic carriage device or postal service.|