Abstract
In diesel fuels which are oxidatively unstable and at least 6 months old, it has been shown that a solid phase can be isolated from the filtered fuels by methanol extraction followed by precipitation with hexane. The weight of this material is directly proportional to the amount of sludge which forms by both accelerated storage stability tests and by continued field aging of the fuels. We have suggested that the presence of this extraction induced precipitate (EIP) or fuel Soluble, Macromolecular, Oxidatively Reactive Species (SMORS) in these fuels thus accounts for the production of thermally induced precipitate (TIP) or insoluble sediment during oxidative aging of diesel fuels. In this paper the acronym EIP will be used in place of SMORS in most cases. This paper describes and summarizes the characterization studies performed to date on the EIP from representative fuels which are all greater than 6 months past production. The origin and apparent role of SMORS in sediment formation in diesel fuels is discussed.
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