Essences
Liquid fuels : petrol and fuels for spark-ignition engines

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Essences


Liquid fuels : petrol and fuels for spark-ignition engines

Authors : Jean-Claude GUIBET, Xavier MONTAGNE

Publication date: April 10, 2011 | Lire en français

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1. Essences

At service stations, particularly in France, motorists are offered several types of petrol; these generally have similar physical properties, but differ in their octane ratings or in their level of "finish", which leads to particular formulations (bases, additives) distributed under specific trade names (since 2006: V-Power, Ultimate, Excellium, for example). In what follows, we will focus on the characteristics of conventional unleaded fuel, known as SP 95 or Eurosuper, which is widely distributed in Europe under EN228 specifications.

1.1 Physical properties

The density, distillation curve and vapor pressure of gasolines are the most important physical characteristics for achieving both satisfactory vehicle operation and low hydrocarbon emissions through evaporation....

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