1.1 BACKGROUND OF THE STUDY
Biodiesel (fatty acid methyl esters) is an alternative fuel for diesel engines. It is an alcohol ester product from the transesterification of triglycerides in vegetable oils or animals accomplished by reacting lower alcohols such as methanol or ethanol with triglycerides.
The National Biodiesel Board (USA) technically defined biodiesel as a mono-alkyl ester. Blends of biodiesel and conventional hydrocarbon based diesel are products most commonly distributed for use in the retail diesel fuel market place. Biodiesel contain no petroleum, but it can be blended at any level with petroleum diesel to create a biodiesel blend. Much of the world uses a system known as the “B” factor to state the amount of biodiesel in any fuel mix:
Blends of less than 20% biodiesel can be used in diesel equipment with no, or only minor modifications. Biodiesel can also be used in its pure form (B100), but may be blended with petroleum diesel at any concentration in most injection pump diesel engine. New extreme high-pressure (29000 psi) common rail engine have strict factory limits of B5 or B20 depending on manufacturers.
Biodiesel has different solvent properties than petrodiesel, and will degrade natural rubber gaskets and hoses in vehicles (mostly vehicles manufactured before 1992), although these tend to wear out naturally and most likely will have already been replaced with FKM, which is non reactive to biodiesel.
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