FUEL 9 |
| Numerous methods have been used to study the oxidative stability of biodiesel. Among the easiest and most rapid methods are acid value and kinematic viscosity. These methods and most others, however, do not furnish information on the composition of the oxidized fuel. Nuclear magnetic resonance (NMR) is widely applied to the structure determination of organic compounds. In the realm of oleochemistry it has also found applications quantifying components and determining the fatty acid profile of vegetable oils. In the present work, 1H-NMR was used to study the composition of biodiesel oxidized in open vessels at elevated temperatures. The results show enrichment of monounsaturated fatty acid chains and a decrease of diunsaturated species. The double bond at C15, originally found in the triunsaturated fatty acid chains, appears relatively stable towards oxidation. The results coincided with other methods such as kinematic viscosity and acid value. |
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Biofuels for Transportation
8:55 AM-12:05 PM, Sunday, 26 March 2006 Georgia World Congress Center -- C204, Oral
Division of Fuel Chemistry |