DOI: 10.5593/SGEM2014/B41/S17.059


A. E. Sterpu, C. I. Koncsag, A. I. Dumitru, T. Chis, S. Pascu
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-15-5 / ISSN 1314-2704, June 19-25, 2014, Book 4, Vol. 1, 457-464 pp

In the recent years, the quality characteristics of the gasoline have been
reviewed, in order to get environmentally friendly fuels with less sulfur, higher octane number, less VOC emissions. For this purpose, besides improving processes to obtain better quality gasoline compounds, the replacement of a small part of them with alternative fuels was imposed. One of the quality characteristics is the vapor pressure of the final product whose effect on the VOCs emissions is direct. With the aim to improve the octane number, the vapor pressure is affected too and as a consequence, the VOCs emissions. The aim of this paper is to study blending recipes of conventional fuels and the effect of adding alternative fuels such as bioethanol, methanol, 1-propanol, 1-butanol and MTBE, from the viewpoint of vapour pressure and VOCs emissions. Reid vapour pressure (RVP) was the main characteristic measured with conventional Reid apparatus but also with a modern MINI variant of the said apparatus, keeping always in view fulfiling the octane number requirements. The octane number was measured in an experimental engine. The results showed that hydrocarbons heavier than hexane and, surprisingly, the addition of MTBE up to 3% vol lower the RVP, with dramatic increase over this concentration. The methanol increases by 24 kPa the RVP up to 10% vol in blendings. Bioethanol brings about an increasing of max. 10 kPa of the RVP, in any concentration and heavier alcohols don’t affect the values of RVP. The authors explain these tendencies and conclude about blending rules to mitigate VOCs emissions.

Keywords: gasoline compounds, Reid Vapour Pressure, VOCs emissions