Vapor Pressure Characteristics of M85 Methanol Fuels

Paper #:
  • 912415

Published:
  • 1991-10-01
Citation:
Furey, R. and Perry, K., "Vapor Pressure Characteristics of M85 Methanol Fuels," SAE Technical Paper 912415, 1991, https://doi.org/10.4271/912415.
Pages:
15
Abstract:
This study was undertaken to determine the vapor pressure characteristics of M85 fuel, a mixture of 85 percent methanol and 15 percent gasoline or other hydrocarbons. For M85 fuels made with full-boiling-range gasolines, the vapor pressure of the M85 fuel at 37.8°C increased linearly with an increase in the vapor pressure of the gasoline. A different linear relationship was obtained for M85 fuels made with pure hydrocarbons rather than with gasolines. The vapor pressure of an M85 fuel was higher when the hydrocarbon component was a pure hydrocarbon or simple hydrocarbon mixture rather than a gasoline of the same vapor pressure.Vapor pressure vs. temperature characteristics were measured for a number of M85 fuels and the hydrocarbons from which they were made. In most cases, a change in temperature caused a greater change in the vapor pressure of the M85 fuel than in the vapor pressure of the hydrocarbon component of the M85.
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