Abstract
Five different synthetic antioxidants were evaluated to improve the oxidation stability of high polyunsaturated biodiesel fuel produced by transesterification of fish oil. Butylhydroxy toluene (BHT), propyl 3,4,5-trihydroxybenzoate and dodecyl 3,4,5-trihydroxybenzoate were not effective for improvement of the oxidation stability of the fish oil biodiesel, whereas t-butylhydroquinone (TBHQ) showed best performance to improve oxidation stability. In 5 mass% fish oil biodiesel/tetradecane mixture, the antioxidation effect of BHT continued longer than that of TBHQ because of the difference of solubility against the mixed solution.
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