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Blending Behavior of Hydrocarbon And Oxygenate Molecules to Optimize RON and MON for Modern Spark-Ignition Engines (SI)
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on September 15, 2020 by SAE International in United States
Author´s name(s): Lotta Knuutila (1), Anna Karvo (2), Teemu Sarjovaara (2), Ulla Kiiski (2), Martti Larmi (1), Annukka Santasalo-Aarnio (1) Affliation: (1) Research Group of Energy Conversion, Department of Mechanical Engineering, Aalto University, Finland (2) Neste Oyj, Finland Gasoline octane blending is known to be complicated, because gasoline fractions with different RONs do not blend linearly always, instead they can blend non-linearly; synergistic or antagonistic. Linear and non-linear octane blending is not broadly researched topic, even though octane number is regulated property and, also has an influence on the revenues of the oil refinery. To combust gasoline completely in the engine could reduce the emission that is also the target in the developing of the modern spark-ignition engines (SI). Therefore, the properties of gasoline, especially RON, need to be optimized to ensure its proper ignition in the engine and prevent the harmful autoignition reactions. There are hundreds of hydrocarbons in gasoline which have different Research Octane Numbers (RONs). Reactivity is one property that can help to evaluate RON of hydrocarbons because the more reactive hydrocarbons have lower RON. For instance, longer n-paraffins have lower RON compared to aromatics that contain six π electrons that are delocalized around their ring which increases stability of aromatics and thus, RON. In this paper, is studied the octane blending of different hydrocarbons and oxygenate compounds that helps to focus on mix those gasoline components and produce the high-octane number gasoline. The study showed ethanol to blend non-linearly, but synergistic with paraffins and olefins, while the blending with aromatics was antagonistic. It was noticed also hydrocarbons (paraffins) with the same functionalities blend linearly and oxygenate compounds such as furans were noticed to blend synergistic with hydrocarbons. However, RON of gasoline is not that simply to investigate, because gasoline is not blend of two components, it is blend of many isomers and functional groups. For instance, this study noticed that blend of many hydrocarbon groups together with ethanol, the magnitude of synergism varies depending on the share of different hydrocarbons in gasoline. The Research Group of Energy Conversion, Department of Mechanical Engineering, School of Engineering, Aalto University, PO Box 14400, FI-00076 AALTO, Finland. Contact email: email@example.com; phone: +358 50 4722 108