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Technical Committee Fuel Oils

Determination of the Chemical and Physical Stability of Middle Distillates with Various Alternative Components under Different Storage Conditions

Due to the shortage of oil reserves and the consequences of the use of fossil fuels, alternatives to conventional fuels are being sought worldwide. Alternative fuels such as biodiesel and synthetic products have the potential to significantly reduce the GHG emissions of technical processes. Already today, there are a large number of production processes for alternative fuels and thus an equally large variance of the same. If the potential of alternative raw materials is to be fully exploited, the properties and interactions of the fuels in potentially emerging multi-component blends must be investigated.

In the project, standardized fuel testing methods were made usable for the investigation of new types of fuels. Furthermore, the long-term storage behaviour of multi-component fuels could be characterised. The influences of individual fuels on the property changes of the complex fuel matrix during storage and fuel aging were identified. Furthermore, a long-term storage stability model of complex fuels with high paraffin content was developed. A detailed analytical method was developed for the molecular identification of ageing processes and products. In particular, the ageing products of FAME, which are formed under oxygen incorporation, could be comprehensively determined. Contrary to previous findings in other research projects, the incorporation mechanism does not only occur at the double bond, but mainly in the head part of the esters, i.e. between the ester group and the incorporated double bonds.

Although the sample matrix considered in the project was very extensive, the results could not be statistically validated. The structural clarification of the fuels and ageing products is also still in its infancy. A consideration of the influence of additives has so far only taken place in a rudimentary way. The solution of these tasks requires further research.

The IGF project (19965 N) of the research association DGMK Deutsche Wissenschaftliche Gesellschaft für Erdöl, Erdgas und Kohle e.V., Überseering 40, 22297 Hamburg, Germany, was funded by the Federal Ministry for Economic Affairs and Energy via the German Federation of Industrial Research Associations (AiF) within the framework of the programme for the promotion of joint industrial research (IGF) on the basis of a resolution of the German Bundestag.

OWI Science for Fuels gGmbH An-Institute of RWTH Aachen University:
Nina Mebus, Sebastian Feldhoff, Dr. Wilfried Plum
Max Planck Institute for Coal Research:
Prof. Dr. Wolfgang Schrader, David Hamacher
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