Accession Number : ADA197169


Title :   Gum and Deposit Formation in Diesel Fuels


Descriptive Note : Final rept. 1984-1988


Corporate Author : SRI INTERNATIONAL MENLO PARK CA


Personal Author(s) : Mayo, Frank R ; Mill, Theodore


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a197169.pdf


Report Date : 15 May 1988


Pagination or Media Count : 107


Abstract : We examined two aspects of the stability of diesel fuels in storage: the formation of sediments in suspension, which subsequently clog filters, and the formation of soluble gum, which passes the filters but then forms hard deposits on hot engine parts. Research on fuel stability at SRI during the last 6 years has shown that soluble gum appears first on storage, and then part of it grows into sediment. If the oxidation mixture is agitated gently, the precipitating gum grows on the surface gum, and no loose sediment is formed. We distinguished three mechanisms of gum formation: (1) a process intimately associated with chain propagation and termination during oxidation, (2) a coupling of fuel molecules by decomposing peroxides in the absence of oxygen, and (3) a condensation of naphthols and aldehydes from the oxidation of alkylnaphthalenes. The polymeric oxidation products from a JP-8 fuel are shown to be largely responsible for deposits in the Jet Fuel Thermal Oxidation Tester (JFTOT).


Descriptors :   *DEPOSITS , *DIESEL FUELS , *FUELS , ENGINE COMPONENTS , POLYMERS , OXYGEN , PEROXIDES , ALDEHYDES , COUPLING(INTERACTION) , STORAGE , SEDIMENTS , STABILITY , PROPAGATION , ENGINES


Subject Categories : Fuels


Distribution Statement : APPROVED FOR PUBLIC RELEASE