Octane Numbers of Ethanol- and Methanol-Gasoline Blends Estimated from Molar Concentrations

被引:132
作者
Anderson, J. E. [1 ]
Kramer, U. [2 ]
Mueller, S. A. [1 ]
Wallington, T. J. [1 ]
机构
[1] Ford Motor Co, Res & Adv Engn, Syst Analyt & Environm Sci Dept, Dearborn, MI 48121 USA
[2] Ford Motor Co, Res & Adv Engn Europe, Powertrain Res & Adv Dept, D-50725 Cologne, Germany
关键词
EMISSIONS;
D O I
10.1021/ef101125c
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
080707 [能源环境工程]; 082001 [油气井工程];
摘要
When expressed using volumetric concentrations (as is industry practice), the addition of relatively small amounts of ethanol or methanol (e.g., 10% by volume) to gasoline appears to result in disproportionately large, nonlinear increases in research octane number (RON) and motor octane number (MON). As a result, volumetric "blending octane numbers" are of limited value for estimating the octane number of alcohol-gasoline blends because they vary with alcohol content and base gasoline composition. We show that RON and MON increases with alcohol content are approximately linear when expressed using molar concentrations. Moreover, molar-based blending octane numbers are effectively equal to the octane numbers of the pure alcohols for most base gasolines. A limited dependence on gasoline composition was observed, namely, greater-than-predicted octane numbers for ethanol-gasoline blends with unusually high isoparaffin content. We suggest that octane numbers of methanol-gasoline and ethanol-gasoline blends can be estimated conveniently and more accurately from their molar composition by linear interpolation between the octane numbers of the base gasoline and the pure alcohol.
引用
收藏
页码:6576 / 6585
页数:10
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