By : admin, 28 January 2015
Feedstock for bioethanol production
Instead of chemical synthesis, fermentation of simple sugars by yeast is currently used extensively to produce ethanol from renewable sugar-containing biomass. The feedstock for bioethanol production is categorized as:
1) First generation feedstock which are sugar and starch crops. The major sugar crops are sugar cane, sugar beet and their molasses, i.e. by-product from sugar production and sweet sorghum while the major starch crops are corn and cassava.
2) Second generation feedstock which are lignocellulosic materials derived from agricultural residues or agro-industrial waste such as sugar cane bagasse, corn cob or stover, wheat and rice straw, empty fruit bunches of oil palm.
The key producers of bioethanol in the world are USA by using corn, accounting for 61% of total global production, followed by Brazil using sugar cane (26% of total global production). In Europe, sugar beet is mainly used as the feedstock, with some other starch feedstock including corn, wheat, rye and barley. In China, corn, wheat and cassava are the main feedstock for bioethanol production.