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Volatility Characteristics of Gasoline-Alcohol and Gasoline-Ether Fuel Blends
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 01, 1985 by SAE International in United States
Annotation ability available
During several test programs involving evaporative emissions and driveability, the vapor pressures and distillation characteristics of a large number of gasoline-alcohol and gasoline-ether fuel blends were measured. The maximum increases in Reid vapor pressure (RVP) above that of the gasoline alone ranged from 1.0 kPa (0.2 psi) for tertiary-butyl alcohol to 23.4 kPa (3.1 psi) for methanol. As little as 0.25 percent methanol, ethanol, or Oxinol ™ 50 (a 1:1 mixture of methanol and gasoline-grade tertiary-butyl alcohol) produced measurable increases in RVP.
Because of the nonlinear response of RVP to alcohol concentration, mixing a gasoline and a gasoline-alcohol blend of the same RVP can produce a fuel with a higher RVP.
The vapor pressures of fifteen gasolines and gasoline-alcohol blends were measured at several vapor-to-liquid ratios (V/L), With an increase in V/L, the vapor pressures of the gasolines were reduced more than the vapor pressures of the blends. Thus, the blends behaved as more volatile fuels than gasolines of equal RVP.
CitationFurey, R., "Volatility Characteristics of Gasoline-Alcohol and Gasoline-Ether Fuel Blends," SAE Technical Paper 852116, 1985, https://doi.org/10.4271/852116.
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