Three types of agrofuel
Agrofuels (also called biofuels) are agriculture-based fuels. There are three main types: alcohol-based agrofuels which are used in petrol engines; oil-based agrofuels which are used in diesel engines; and agrofuels made of gas.
Alcohol-based agrofuels are produced from plants rich in sugar such as sugarcane or sugar beet, or from plants rich in starch, such as wheat. These agrofuels include bioethanol and its derivative ETBE (Ethyl tert-butyl ether).
The oils are extracted from oleaginous plants such as rapeseed, palm, sunflower or soybean. They can be pure vegetable oils, referred to as "raw oils" (these are sometimes cooking oils), or processed products. In the latter case, one speaks of diester, biodiesel or VOME (vegetable oil methyl esters). Both are made from 90% oil and 10% methanol, a petroleum derivative.
The gases are produced by fermenting organic matter. The r...