**3.2 Production of ethanol**

Ethanol also called as grain alcohol or ethyl alcohol**.** The purest form of ethanol is colorless liquid, flammable and boiling point 78.5°C. Compared to many other fuels, ethanol burns more cleanly and produces carbon dioxide and water. Hence, ethanol was considered as eco-friendly fuel for transportation process. Moreover, ethanol has high octane rating than gasoline, requiring changes to the spark timing in engines.
