Biodiesel is a diesel fuel produced from plants, also called a biofuel.
Produced from vegetable oils (energy crops, recycling of frying oil) or, less often, from animal fat (recycling), biodiesel is created by the transesterification of lipids with an alcohol, in order to produce fatty acid methyl ester (FAME).
In France, this ester is also called Diester, a brand name marketed by Sofiproteol.
B5, B30 or B100 (5%, 30% and 100% biofuel, respectively) differ based on the concentration of biodiesel in the fuel sold. Diesel engines do not require any particular modification in order to use fuel that contains up to 30% biodiesel.
A biodiesel pump supplying diesel containing 99.9% biofuel (B99.9). © ellyjonez CC-by 2.0