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Abstract

Due to global warming and along with the increasing of gasoline price, renewable energy such as biodiesel becomes more important. In this study supercritical methanol with CO2 as co-solvent was applied to decrease the supercritical point, and oil was reacted with supercritical methanol to produce biodiesel. High conversion can be obtained in a few minutes.
In this study a reactor which can work under high pressure (300 bar) and temperature (300oC) was built. Firstly rice bran was used as the starting material for producing FAMEs and it was found that rice bran was carbonized. After that rice bran oil was employed to react with methanol using CO2 as co-solvent, the conversion and yield of biodiesel at 300 bar and 300oC were 93.30% and 89.25%, respectively. Some impurities, mainly hydrocarbons, were discovered in the reaction product. Refine soybean oil (> 99% TAGs) was used to replace rice bran oil in order to check the origin of impurities.

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