Preventing fuel-related problems before they develop, whether during the production, transportation, storage or combustion of fuel, is a goal of everyone working in the fuel industry.Recent testing of biodiesel blends by ASTM D 4625, a long-term storage stability test method, has identified the formation of sediment in stored B5 and B20 blends. The sediment components have been analyzed and are shown to originate from the reaction of oxygen in the air with unsaturated methyl oleate and methyl linoleate compounds in B100. However, antioxidant addition to B100 prior to blending with ultra-low sulfur diesel (ULSD) to produce B5 and B20 biodiesel blends prevented sediment formation during long-term storage.
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