Abstract

Vegetable oils and Animal Fats (triglycerides) were the first liquid fuels used in the rise of civilization, and again are a potential source of alternate diesel fuel. They are twenty times as viscous as diesel fuel however, and so form carbon deposits on diesel cylinders and injectors. Transesterification with methanol cleaves the oil/fat molecule and removes the glycerine, yielding a viscosity and other properties comparable to that of diesel. The resulting esters have been called “biodiesel” and are now being tested in Europe and the U. S. The heat of combustion of biodiesel is 95% of that for conventional diesel (on a volume basis). Biodiesel has a Cetane number of 50-80 (compared to typically 42 for diesel). The Cetane number is important in determining emissions.

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