The present invention includes methods for removing contaminants, such as mineral salts, mineral acids, terpenoids, stilbenes, flavonoids, proteinaceous materials, metal impurities, ash and other organic products, from a lignocellulosic feedstock stream containing oxygenated hydrocarbons.
FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
 This invention was made with government support under an award provided by the U.S. Department of Energy, Award No. DE-EE0003044. The government has certain rights in the invention.