Data missing from July 2021

thumb|Experimental French Régiolis Class train using biodiesel thumb|Space-filling model of ethyl stearate, or stearic acid ethyl ester, an ethyl ester produced from soybean or canola oil and ethanol thumb|Two general pathways for biodiesels from a fat. The process starts with hydrogenation of backbone double bonds. [[Fatty acid methyl esters can then be produced by transesterification. C16 and C18 diesel fuels arise by hydrogenolysis of the saturated fat.]]