58Gasoline Octane Number Improvement by Ethanol as an Oxygenated Compound


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)


  • Hsieh, W.D., Chen, R.H., Wu, T.L. and Lin, T.H. (2002) ‘Engine Performance and Pollutant Emission of an SI Engine Using Ethanol-Gasoline Blended Fuels’, Atmospheric Environment: Seventh Internatioonal Conference on Atmospheric Science and Appl ications to Air Quality (ASAAQ). Taiwan, 9 October 2001. Atmospheric Environment 36: 403–410.
  • Yao, Y.C., Tsai, J.H. and Chiang, H.L. (2011). Emissions of Organic Air Toxics from a Four-Stroke Motorcycle Using Ethanol-Blended Gasoline. Environ. Eng. Sci. 28: 147–158.
  • Poulopoulos, S.G., Samaras, D.P. and Philippopoulos, C.J. (2001) ‘Regulated and Unregulated Emissions from an Internal Combustion Engine Operating on Ethanol Containing Fuels’, Atmospheric Environment: Seventh Internatioonal Conference on Atmospheric Science and Appl ications to Air Quality (ASAAQ). Taiwan, 27 April 2001 Atmospheric Environment 35 (2001) 4399–4406.
  • Niven, R.K. (2005) ‘Ethanol in Gasoline: Environmental Impacts and Sustainability Review Article’, Renewable and Sustainable Energy Reviews, Volume 9, Issue 6, December 2005, Pages 535–555.
  • Coetho, E.P.D., Moles, C.W., Marco Santos, A.C., Barwick, M. and Chiarelli, P.M. (1996) ‘Fuel Injection Components Developed for Brazilian Fuels’ SAE Technical Paper, 962350, Society of Automotive Engineers, Warrendale, PA.
  • Naegeli, D.W., Lacey, P.I., Alger, M.J. and Endicott, D.L. (1997) ‘Surface Corrosion in Ethanol Fuel Pumps’, SAE Technical Paper, 971648, Society of Automotive Engineers, Warrendale, PA.
  • Charles, M.B., Ryan, R., Ryan, N. and Oloruntoba, R. (2007). Public Policy and Biofuels: The Way Forward? Energy Policy 35: 5737–5746.
  • Biofuels Association of Australia (2015) Biofuels Association of Australia.
  • Speight, J. G, (2007) The Chemistry and Technology of Petroleum: Products-Gasoline. Fourth Edition. US- New York: CRC Press Taylor & Francis Group.
  • Foong, T., M, Morganti K., J., Brear M., J., Silva G., d., Yang Y. and Dryer F., L., (2013) ‘The octane numbers of ethanol blended with gasoline and its surrogates’, Fuel 115 (2014) 727–739.