Fuels derived from biomass can be converted directly into liquid fuels called biofuels. The two most common types of biofuels in use today are ethanol and biodiesel, both representing the first generation of biofuel technology.
Ethanol is a renewable fuel made from various plant materials known as biomass and is an alcohol used as a blending agent with gasoline to increase octane and cut down carbon monoxide and other emissions.
Biodiesel is a liquid fuel produced by combining alcohol with renewable sources, such as new and used vegetable oils, animal fats, and recycled cooking grease, and is a cleaner-burning replacement for petroleum-based diesel fuel.
Pure biodiesel, sometimes referred to as FAME (Fatty Acid Methyl Esters), or B100 is used to blend with petrodiesel. Blends of B100 with petrodiesel are named based on the percentage of B100 in the blend, ie B6 is 6% B100 to 94% petrodiesel. The ranges B6 to B20 are in the Standard Specification for Diesel Fuel Oil, Biodiesel Blend, D7467.
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