TECHNOLOGY
high-performing and cost-effective substitute for petrochemical products . Today , it believes that an alcohol called isobutanol — which can be chemically processed into a ‘ drop-in ’ replacement for jet fuel and gasoline — is the solution .
“ Isobutanol is interesting because it can be made from carbohydrates by fermentation ,” Gruber explains . “ If we do this right , and we believe we have , then the whole process is economical and can compete at a relatively low oil price and provide a product that is fully renewable resource-based .”
Gevo initially produces isobutanol , as well as ethanol , at its fermentation plant in Luverne , Minnesota . The isobutanol made there are then sent to the company ’ s biorefinery in Silsbee , Texas for conversion into renewable jet fuel and gasoline . The jet fuel and gasoline made from isobtuanol are not only cleaner when burned — they can also have a higher energy density than typical fossil fuels .
At present , the energy used to produce Gevo ’ s biofuels is not generated via clean sources . This ultimately results in a 50 percent reduction in greenhouse gas emissions when they are substituted for fossil fuels . Gruber believes that the issue of sourcing clean process energy will be resolved further down the line , once both the market and production infrastructure are more mature .
“ Is it possible to get to a zero greenhouse gas footprint with products like this ?” Gruber asks . “ I believe the answer is yes . It depends upon our sources of energy for steam and electricity .”
Thus far , companies including Lufthansa and Alaska Airlines have tested Gevo ’ s isobutanol-based jet fuel for their planes . The key component
16 August 2016