Abstract
Application of Full Factorial Design to Evaluate the Effect of Different Variables on the Stability of Biodiesel:Diesel Blends under Storage Conditions
Highlights
The gradual depletion of fossil fuel has increased the need to look for alternatives
As far as we know, no studies in the literature have evaluated simultaneously how the variables involved in the degradation process of biodiesel:diesel blends may affect it in storage conditions
The percentage conversion (%C) of vegetable oil in biodiesel is given by equation %C = 100 × (2A1 / 3A2), where A1 is the area obtained in the NMR spectrum at 3.7 ppm related to the three hydrogens of the methoxy groups (-OCH3), and A2 is the area obtained at 2.3 ppm related to the two hydrogens of α-carbonyl methylene groups (-CH2CO).[30]
Summary
The gradual depletion of fossil fuel has increased the need to look for alternatives. Few studies have simulated the usual storage conditions of biodiesel:diesel blends in order to evaluate their degradation. As far as we know, no studies in the literature have evaluated simultaneously how the variables involved in the degradation process of biodiesel:diesel blends may affect it in storage conditions. The aim of the present study was the application of a full factorial design to evaluate the effect of different variables on the stability of soybean-derived biodiesel:diesel blends under storage conditions similar to those found in Brazilian real situations. The degradation was evaluated based on the direct measurement of methyl linoleate and methyl oleate in the blends by GC/MS using the selective ion monitoring (SIM) mode These unsaturated fatty acid methyl esters are target compounds in the oxidation process. Pentadecanoyl propanoate (the internal standard) was synthesized, purified and characterized as previously reported by our research group.[27]
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