Design and preliminary results of an NMR tube reactor to study the oxidative degradation of fatty acid methyl ester
Chuck, C. J., Jenkins, R. W., Bannister, C. D., Han, L. and Lowe, J. P., 2012. Design and preliminary results of an NMR tube reactor to study the oxidative degradation of fatty acid methyl ester. Biomass and Bioenergy, 47, pp. 188-194.
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Biodiesel is the fatty acid alkyl esters produced by the transesterification of vegetable, animal or microbial lipids. After ethanol, it accounts for the largest proportion of global biofuel production. Yet, due to the level of polyunsaturation, biodiesel is also oxidatively unstable. When biodiesel oxidises the viscosity increases, which leads to reduced fuel performance and in extreme cases can lead to engine failure. To aid in understanding the process of this degradation a specialist NMR tube rig was designed to assess the oxidation of biodiesel. The NMR tube rig allowed the in situ1H NMR measurement of the sample while air was bubbled through at fixed intervals. The methyl esters of linolenic acid (18:3), linoleic acid (18:2) and oleic acid (18:1) were oxidised at 110 °C over a 24 h period. The decomposition of biodiesel is complex, and there is more than one mechanism involved in the degradation. Using this rig the onset of oxidation for 18:3 and 18:2 was found to be almost instantaneous. The rate of oxidation was found to be slightly less for 18:2 than 18:3 while the maximum rate was observed for 18:3 from the beginning of the oxidation, this was only observed after 280 min for 18:2. The oxidation of 18:1 started at approximately 500 min and, slowly degraded during the remaining reaction time. The formation of a number of secondary oxidation products such as aldehydes, ketones, alcohols and formates were also quantified.
|Creators||Chuck, C. J., Jenkins, R. W., Bannister, C. D., Han, L. and Lowe, J. P.|
|Departments||Faculty of Humanities & Social Sciences > Education|
Faculty of Engineering & Design > Chemical Engineering
Faculty of Engineering & Design > Mechanical Engineering
Faculty of Science > Chemistry
|Research Centres||Centre for Sustainable Chemical Technologies|
|Publisher Statement||Chuck_Biomass_Bioenergy_2012.pdf: NOTICE: this is the author’s version of a work that was accepted for publication in Biomass and Bioenergy. 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 Biomass and Bioenergy, 2012, vol 47, DOI 10.1016/j.biombioe.2012.09.043|
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