engleski

Diesel biolubricants - synthesis and characterisation

Over the past decade, regulations have been changed to reduce the environmental impact of diesel fuel reducing the content of sulphur and aromatics. This has resulted in a deterioration of low-temperature properties and lubricity. Also more attention has been given to renewability of the products to lessen the impact on the environment. To overcome this problem we synthesized biolubricants that improve lubricity but do not deteriorate low-temperature properties. Through the esterification and transesterification reaction, we synthesized esters from levulinic acid and waste sunflower oil, and alcohols with different shapes and chain lengths, to investigate the influence of the source of the raw material and the selected alcohol on the application properties of the fuel formulations. To test the influence of bioadditives on the properties of diesel fuel, formulations of diesel and bioadditives with a concentration of up to 10 wt% (from levulinic acid) and up to 20 vol% (from linoleic and oleic acid derived from waste sunflower oil) were prepared. The formulations were tested for density, kinematic viscosity, pour point, and lubricity. From the results obtained, the bioadditives affect slightly the density and viscosity, but all values still remain within the standard limits meaning they won’t affect the quality of combustion. The synthesized bioadditives had no negative effect on the pour point, while the lubricity of the diesel formulations improved by more than 40%.

bioadditives ; lubricity ; pour point ; biodiesel ; diesel

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