Abstract
Biodiesel is a fuel composed by fatty acid esters, usually methyl esters (FAME), have common structural features, as allylic hydrogens, bis-allylic hydrogens and secondary hydroxyl, that determinate its oxidative stability. In this study, the oxidation temperature (OT) of biodiesels formulated from a mixture design of methyl stearate, methyl oleate, methyl linoleate and methyl ricinoleate was determined by pressurized differential scanning calorimetry (PDSC). The generic representation CaHbHc∗Hd∗∗He∗∗∗O2(OH)f for the mixtures was developed and their coefficients were used as parameters to describe the OT. A non-linear dependence of OT with the descriptors of allylic hydrogen Hc∗, bis-allylic hydrogen Hd∗∗ and secondary hydroxyls (OH)f were observed in the empirical domain Dexp={(a;c,d,f) ∈R3; 0⩽c⩽4 and 0⩽d⩽2 and 0⩽f⩽1 and a=19}, where the Ca parameter for chain length was kept fixed.
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