Biodiesel Fuel from Vegetable Oil Wastes by Supercritical Methanol.

概要

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The transesterification reaction of rapeseed oil in supercritical methanol was investigated in this study, without using any catalyst. It was consequently demonstrated that, in a preheating temperature of 350°C, 240 sec of supercritical treatment of methanol was sufficient to convert rapeseed oil to methyl esters with the molar ratio of methanol in triglycerides being 42. In addition, although prepared methyl esters were basically the same as those of the common method with a basic catalyst, the yield of methyl esters by the former was found to be higher than that by the latter due to a successful methyl esterification of free fatty acids present in the rapeseed oil. Furthermore, the kinetics study showed that the conversion rate of rapeseed oil to its methyl esters was found to increase dramatically in the supercritical state. Therefore, supercritical methanol process which requires the shorter reaction time and simpler purification procedure because of the catalyst unused, would become a powerful method for recycling vegetable oil wastes to biodiesel fuel.
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