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Please use this identifier to cite or link to this item: http://hdl.handle.net/11019/1520

Title: Evaluation of the Effect of Tocopherols on the Stability of Biodiesel
Authors: Fröhlich, A.
Keywords: biodiesel-grade methyl esters.
tocopherols
carotenoids
stability
Issue Date: 1-Apr-2005
Publisher: Teagasc
Citation: Fröhlich, A., Evaluation of the Effect of Tocopherols on the Stability of Biodiesel, End of Project Reports, Teagasc, 2005.
Series/Report no.: End of Project Reports;
Abstract: A comprehensive study was carried out on the effects of naturally occurring tocopherols and carotenoids on the stability of biodiesel-grade methyl esters. Commercially available tocopherols and carotenoids, α-, γ- and δ-tocopherol, carotene and asthaxanthin, were added to destabilised methyl esters and the solutions were exposed to air at 65oC. The stabilising effect of the added tocopherols and carotenoids was determined from the number of days needed to reach the same increase of viscosity as destabilised methyl ester without tocopherols after 1 day. All three tocopherols stabilised methyl esters; γ- being the most effective and α- the least. The stabilising effect of tocopherols increased with concentration up to an optimum level. Concentrations above this level did not improve stability significantly. The stabilising effect of the tocopherols also depended on the composition of the methyl ester; they were most effective in tallow methyl ester, and had the least effect on sunflower methyl ester. Carotene and asthaxanthin had no effect on the stability of the methyl esters. However an unidentified carotenoid in rape methyl ester changed the oxidation pattern by reducing rates of peroxide and viscosity increase, without affecting overall stability.
Description: End of Project Report
URI: http://hdl.handle.net/11019/1520
Appears in Collections:CELUP End of Project Reports

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