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Highlights• High yields were obtained when using H 2 O 2 /Formic Acid for epoxidizing recycled vegetable fatty acids.• The iodine value of the fatty acid indicates the highest degree of epoxidation at the end of the process.• It is possible to correlate the progress of epoxidation from infrared studies.• Coefficient of determination (r 2 ) up to 0.995 was obtained by comparing the two methodologies for monitoring the epoxidation.