Abstract
Used frying oil seems to be an economically viable and environmentally attractive alternative for biodiesel production, but the acceptance and successful use of this and other biodiesels obtained from waste materials require careful evaluation of its fuel properties and impurities. Herein, we show that biodiesel made from used frying soybean oil display overall quality comparable to those obtained from the fresh oil as measured by standard parameters of fuel quality such as induction period, acid number, heat of combustion, and iodine value as well as at the molecular level via profiles of intact and oxidized fatty acid methyl esters. These profiles were obtained directly from the biodiesel samples by easy ambient sonic spray ionization mass spectrometry. An artificial antioxidant, N,N′-di-sec-butyl-p-phenylenediamine, was shown to significantly increase the oxidative stability of the used frying oil biodiesel at trace level.
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Acknowledgments
We thank the following Brazilian Science Foundations, CNPq, FAPESP, and FINEP for financial support. We also thank Dr. Carmen Dobarganes for comments and suggestions.
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Alberici, R.M., de Souza, V., de Sá, G.F. et al. Used Frying Oil: A Proper Feedstock for Biodiesel Production?. Bioenerg. Res. 5, 1002–1008 (2012). https://doi.org/10.1007/s12155-012-9216-0
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DOI: https://doi.org/10.1007/s12155-012-9216-0