Biodiesel oxidative stability from Rancimat data

Show simple item record Focke, Walter Wilhelm Van der Westhuizen, Isbe Oosthuysen, Xander 2016-05-31T07:12:25Z 2016-06
dc.description.abstract It is conventional to quantify the oxidative stability of oils and biodiesel through an induction time deter-mined by a Rancimat instrument. European Standard EN 14112 for the Rancimat method describes twoprocedures for determining this induction period. The automated method relies on finding the positionof the peak in the second derivative of the conductivity vs. time curve. The manual method is based on theintersection of two tangents lines. It is shown that this method can also be automated by a curve fittingapproach based on a novel Rancimat response function. This analysis demonstrates that the inductionperiod values determined by the two methods differ with the second derivative method returning slightlyhigher estimates for the induction period.Biodiesel was prepared using base-catalysed methanolysis of sunflower oil. It was stabilized using thehindered phenol antioxidant tetrakis[methylene(3,5-di-t-butyl-4-hydroxyhydrocinnamate)]methane. Itwas found that stability increases linearly with stabiliser concentration and that the effect of the measure-ment temperature follows Arrhenius kinetics. The effectiveness of the antioxidant stabiliser diminishedwith increasing temperature. en_ZA
dc.description.department Chemical Engineering en_ZA
dc.description.embargo 2017-06-30
dc.description.librarian hb2016 en_ZA
dc.description.sponsorship Energy Institutional Research Theme of the University of Pretoria. en_ZA
dc.description.uri en_ZA
dc.identifier.citation Focke, WW, Westhuizen, IVD & Oosthuysen, X 2016, 'Biodiesel oxidative stability from Rancimat data', Thermochimica Acta, vol. 633, pp. 116-121. en_ZA
dc.identifier.issn 0040-6031 (print)
dc.identifier.issn 1872-762X (online)
dc.identifier.other 10.1016/j.tca.2016.03.023
dc.language.iso en en_ZA
dc.publisher Elsevier en_ZA
dc.rights © 2016 Elsevier B.V. All rights reserved. Notice : this is the author’s version of a work that was accepted for publication in Thermochimica Acta. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Thermochimica Acta, vol. 633, pp. 116-121, 2016. doi : 10.1016/j.tca.2016.03.023. en_ZA
dc.subject Oxidative stability en_ZA
dc.subject Induction period en_ZA
dc.subject Rancimat method en_ZA
dc.subject Antioxidants en_ZA
dc.subject Biodiesel en_ZA
dc.title Biodiesel oxidative stability from Rancimat data en_ZA
dc.type Postprint Article en_ZA

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