Bioethanol is mainly produced by fermentation of
starch (corn), sugar (sugar beet, sugar cane) or cellulose
plants. Besides the sugar fermentation process it can
also be produced by the hydrolysis of biomass (cellulose,
lignin). The produced alcohol still contains significant
amounts of water, that has to be removed. Therefore,
in a subsequent distillation process the lower boiling
alcohol is separated from the water. |