ABSTRACT
Ethanol is one of the simplest alcohols, which has long been used in human history. Ethanol can be readily produced by fermentation of simple sugars that are converted from starch crops. This has long been practiced throughout the world. Feedstocks for such fermentation include corn, barley, potato, rice, and wheat. This type of ethanol may be called grain ethanol, whereas ethanol produced from cellulose biomass such as trees and grasses is called bioethanol or biomass ethanol. Both grain ethanol and bioethanol are produced via biochemical processes, whereas chemical ethanol is synthesized by chemical synthesis routes that do not involve fermentation.
