2024-06-192024-06-192017-12CAMARGO, Rubia de Pina Luchetti et al. Produção de biodiesel etílico de óleos e gorduras de fritura residuais via esterificação ácida seguida de transesterificação alcalina. Fronteiras: Journal of Social, Technological and Environmental Science, Anápolis, v. 6, n. 3, p. 19-44, set./dez. 2017. DOI: 10.21664/2238-8869.2017v6i3.p19-44. Disponível em: https://periodicos.unievangelica.edu.br/index.php/fronteiras/article/view/2728. Acesso em: 26 abr. 2024.e- 2238-8869http://repositorio.bc.ufg.br//handle/ri/24632The use of ethanol is fundamental to increase the environmental sustainability of biodiesel, as well as the reuse of residual frying oils (ORF). The present manuscript aimed to optimize the production of ethylic biodiesel from ORF, using a chemically optimized conjugated process of acid esterification followed by an alkaline transesterification, through experimental planning 2³. For the esterification the yield was obtained by the reduction of the acid number and for the transesterification by the percentage of the total ester content, confirmed by the analysis of mono-, di- and triacylglycerides. The optimum ORF ethyl biodiesel production was obtained using the esterification process with 2.5% H2SO4 and ethanol: ORF molar ratio of 11:1 for 4 h, transesterification with 1.5% of the concentration of KOH and molar ratio Ethanol: grease content of 13:1 for 4 h, resulting in a biodidesel with similar quality to commercial ones.porAcesso AbertoProdução de biodieselQuimiometriaPlanejamento fatorialBiodiesel productionQuimiometryFactorial designArtigo10.21664/2238-8869.2017v6i3.p19-44