Estimation of the oxidation temperature of biodiesels from a limited number of chemical parameters

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 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 , bis-allylic hydrogen and secondary hydroxyls were observed in the empirical domain D exp ={(a; c, d, f) ; 0⩽ c ⩽4 and 0⩽ d ⩽2 and 0⩽ f ⩽1 and a =19}, where the Ca parameter for chain length was kept fixed. [Copyright &y& Elsevier]