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Linseed oil is characterized by an elevated concentration of highly unsaturated fatty acids such as linolenic and linoleic acids. This work has the objective to evaluate the effect of the high unsaturation of linseed oil on the reactivity and selectivity of the epoxidation reaction. For this purpose, different kinetic experiments of linseed oil epoxidation with performic acid, produced in situ, and phosphoric acid as catalyst, have been performed and interpreted with a biphasic kinetic model previously tested on soybean oil epoxidation. This model considers the contribution of the main reactions involved in each phase, including the side reactions such as performic acid decomposition and ring opening reactions. The experiments made have been simulated, with the mentioned kinetic model, after the evaluation by mathematical regression of the kinetic and thermodynamic parameters of the model. Then, the obtained results have been compared with those described in the literature for soybean seed oil, considering, in particular, the effect of the different unsaturated fatty acids composition on activity and selectivity.

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A rigorous mathematical model was developed for a complex liquid-liquid-solid system in a batch reactor. The approach is general but well applicable for the indirect epoxidation of vegetable oils according to the concept of Nikolaj Prileschajew, implying in situ prepared percarboxylic acids as epoxidation agents. The model considers intra-and interfacial mass transfer effects coupled to reaction kinetics. The liquid phases were described with chemical approach (aqueous phase) and a reaction-diffusion approach (oil phase). The oil droplets were treated as rigid spheres, in which the overall reaction rate is influenced by chemical reactions and molecular diffusion. The model was tested with a generic example, where two reactions proceeded simultaneously in the aqueous and oil phases. The example (i.e., fatty acid epoxidation) illustrated the power of real multiphase model in epoxidation processes.The proposed modeling concept can be used for optimization purposes for applications, which comprise a complex water-oil-solid catalyst system.