The Effect of Weathering on Octane Quality for Winter-Grade and Summer-Grade Gasolines.
NATIONAL INST FOR PETROLEUM AND ENERGY RESEARCH BARTLESVILLE OK
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Weathering tests were conducted to examine the effects on fuel volatility and octane characteristics. The commercially available gasolines utilized in the study represented a wide geographic distribution for both winter and summer fuels. Aging was accomplished by heating the fuel samples to 110 degrees F and maintaining that temperature for 48 hours. Time histories of Reid Vapor Pressure RFP were conducted. Fuel octane evaluations, both MON and RON, were done. Component characterization by gas chromatography were made to identify components lost during the aging process. The time histories of vapor pressure changes depended to a limited measure on the initial fuel vapor pressure as well as to differences in composition. Butanes and isopentanes were the primary constituents lost due to the weathering. For the most part octane changes due to fuel weathering were minimal.