This paper reports the Research (RON) and Motor (MON) Octane Numbers of gasoline blended with an oxygenated compound “ethanol”. The ethanol concentration was varied from zero to 20%, resulting in a clear picture of the variations of the RONs and MONs in all cases. The observed differences then prompt a systematic study of the variation in the RONs and MONs of ethanol blended with two type of gasoline took it in the Bazyan Oil refinery-Sulaimani and one petrol station before and after isomerization process respectively. Fuel properties of ethanol–gasoline blended fuels were first examined by the standard ASTM methods. Results showed that with increasing the ethanol content, the octane number of the blended fuels is increased until some percent after that any increase in ethanol percent will not affect RON and MON.
Keyword: blended fuel, oxygenated compound, Research Octane Number (RON), Motor Octane Number (MON)
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