Degradation of fats and oils by autoxidation V : effect of dilution on production and decomposition rate during the autoxidation of methyloleate

A kinetic approach to the oxidation of methyl oleate was carried out. The production and decomposition rates of hydroperoxide values of methyl oleate were measured for various concentration under the temperature range of 85°C to 105°C, using air as oxidation gas and methyl laurate and lauric acid as diluents. The experimental results were analyzed using the same reaction rate mechanism as shown in the autoxidation of oleic acid and ethyl oleate, and the following results were obtained; (1) In initial period, oxidation rate of methyl oleate was accelated by adding lauric acid as diluent. (2) Oxidation rate of methyl oleate was decrease with increases in concentration of methyl laurate as a diluent. (3) Auto-acceleration in hydroperoxide production was observed at the intitial step in using methyl laurate as a diluent. (4) The overall rate equation of production of hydroperoxide was represented by the following equation: ... [the rest omitted