Bourkaib, Nor El HoudaIrinislimane, RatibaBelhaneche-Bensemra, Naima2026-02-05202500207233https://doi.org/10.1080/00207233.2025.2529712https://dspace.univ-boumerdes.dz/handle/123456789/16054This study investigates the optimisation of epoxidizing used cooking oil (UCO) using in-situ generated performic acid (PFA), applying a full factorial experimental design and statistical analysis in R. Key process variables included the molar ratios of C=C to hydrogen peroxide and formic acid, reaction temperature (40–60°C), and time (3–5 hours). The optimal conditions C=C:H₂O₂:HCOOH ratio of 1:2.7:0.8, 60°C, and 3 h yielded an oxirane oxygen content (OOC) of 84.2% with 96.3% selectivity. A kinetic study under these conditions revealed a pseudo-first-order reaction, with an activation energy of approximately 14.7 kcal·mol−1. These findings highlight the potential for substituting fresh oil with UCO in industrial epoxide production, promoting resource efficiency and sustainabilityenEpoxidationNATURAL SCIENCES::Chemistry::Physical chemistry::KineticsOilWasteArticle