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| Oxidation degradation characteristics of three kinds of biodiesels |
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| KeyWord:biodiesel Rancimat test half-life method heat value FTIR |
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| Abstract: |
| The rapeseed oil biodiesel, soybean oil biodiesel and Jatropha oil biodiesel were oxidized by Rancimat method. The contents of fatty acid methyl esters in biodiesel after oxidation for different time were determined by GC-MS, and the kinetic parameters (reaction order, rate constant) were calculated by half-life method. At the same time, the relationship between oxidation depth and heat value was studied and the biodiesel samples before and after oxidation were analyzed by FTIR. The results showed that except for methyl stearate in soybean oil biodiesel, the reaction order of major fatty acid methyl esters in three kinds of biodiesels was one. The rate of oxidative degradation of methyl linolenate was the fastest, followed by methyl linoleate ester, methyl oleate, methyl stearate and methyl palmitate. The relationship between oxidative degradation time and heat value was cubic function. In addition, FTIR results showed that with the oxidative degradation time prolonging, the absorbance at 1 740 cm-1 increased, revealing an increasing degradation level of the samples. |
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