''Transformation'' method for calculating the research and motor octane numbers of gasoline blends
To overcome the conceptual and practical difficulties inherent in current methods for estimating the Research and Motor Octanes of unleaded and leaded gasoline blends, a new, general (non-refinery-specific) procedure has been constructed. It incorporates hypotheses on how blending nonlinearities are produced by processes occurring inside a knock test engine. Three effects are considered: interaction of major chemical classes of hydrocarbons, variability of conditions inside the engine when rating different fuels, and sulfur/lead antagonism. Measured component properties rather than ''blending values'' are employed in the calculations. Specifically, the method requires measured Research and Motor Octanes of the components, their concentrations, and contents of olefins, aromatics, and paraffins (saturates). Based on data derived from 564 gasolines of widely varying composition, the standard errors of prediction for the model were found to be approximately four-tenths of an octane number. 12 refs.
- Research Organization:
- API, Washington, DC
- OSTI ID:
- 5267067
- Journal Information:
- Ind. Eng. Chem. Fundam.; (United States), Vol. 20:3
- Country of Publication:
- United States
- Language:
- English
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