Ethanol is one of the most important fuels from renewable
sources that are currently in production at competitive prices. In
Brazil, it is obtained from sugar cane and in the US from corn. However,
present day production is not sufficient to satisfy the demand
for energy. Another strategy involves the use of agricultural or forest
residues with high contents of cellulose and lignin (Olsson
et al., 2001; Zacchi et al., 2006).