Regisztráció és bejelentkezés

Evaluation of material properties of Diesel-biodiesel blends of different origins

The demand for fossil fuels in the transportation and energy sector is still continuously increasing. On the other hand, pollution and emission standards are getting more and more rigorous. Therefore, the importance of having an economical and environmentally friendly solution to this problem is of top priority. Since biodiesels are not only economical but also relatively clean-burning [1], they are a good replacement to the typically used fossil fuels. In Europe, about 21 million tonnes of biodiesels are produced annually.

The properties of biodiesels highly depend on the feedstock; therefore, biodiesels of different origins can vary significantly in terms of combustion characteristics. Furthermore, the allowed blending ratio to conventional Diesel by legislation also differs worldwide. Therefore, information on material properties is of great importance from a practical point of view for the design and operation of heat engines.

In this paper, we focused on the material properties of different biodiesel blends. Coconut Methyl Ester (CME), Palm Methyl Ester (PME), biodiesel from Waste Cooking Oil (WCO), and their blends with conventional Diesel were analysed. The temperature dependence of density, kinematic viscosity and surface tension were investigated. Mixing rules were tested for the aforementioned properties, and mixture behaviour was evaluated [2]. Comprehensive correlations were found for the different mixing ratios. Flash points of the blends were also investigated. The initial boiling points were determined with the help of a modified distillation apparatus. All the used methods and instruments were standardized. Novel correlations were found for the flash points and initial boiling points of the different blends as non-linear behaviour was observed in terms of the mixing ratio. As the fatty acid content of the different samples was acquired, the effect of pure biodiesel composition was also evaluated.


[1] S. Živković and M. Veljković, “Environmental impacts the of production and use of biodiesel,” Environ. Sci. Pollut. Res., vol. 25, no. 1, pp. 191–199, 2018, doi: 10.1007/s11356-017-0649-z.

[2] M. Lapuerta, J. Rodríguez-Fernández, D. Fernández-Rodríguez, and R. Patiño-Camino, “Modeling viscosity of butanol and ethanol blends with diesel and biodiesel fuels,” Fuel, vol. 199, pp. 332–338, 2017, doi:


  • Rizvi Syed Ali Hamza
    Gépészmérnöki alapszak (BSc)
    alapképzés (BA/BSc)


  • Dr. Csemány Dávid
    adjunktus, Energetikai Gépek és Rendszerek Tanszék