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"what biological processes are involved in changing starch into bioethanol"
This is in for tomorrow and I HAVE to finish it today. Please give me appropriate websites to find this information. It has to have the WEB ADDRESS or it won't help..
On a world level, bioethanol is the most used biofuel. It is produced from sugar-containing agricultural products such as sugar cane (Brazil), corn (United States), wheat, sugar beet, waste from sugar refineries, or sweet sorghum. The predominant technology for converting biomass to ethanol is fermentation, which is a mature bio-chemical technology. In this process, the biomass is decomposed using micro organisms (bacteria or enzymes). Then, yeast converts the sugars present in the biomass to alcohol. Finally, the ethanol is distilled and dehydrated to obtain a higher concentration of alcohol to achieve the required purity to make the bioethanol suitable for the use as automotive fuel. Ethanol is best used in a spark ignition or Otto engine because of its high octane rating, implying very good anti-knock characteristics. However, when applying bioethanol as a petrol substitute, the lower vapour pressure and volumetric energy content (ca. two-third of that of petrol) should be taken into account. Moreover, ethanol is corrosive towards certain kinds of plastics and metals, but this does not cause problems in low-proportion blends with petrol.
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