Other advantages of the supercritical transesterification are that the separation of the biodiesel product and glycerol byproduct is simpler because the products are not miscible at ambient temperature, there is no catalyst in the mixture to be removed [2,9] and the reaction times are shorter (5 and 60 min, depending on the reaction temperature and pressure, the type of reactor and the fatty acid composition of the oil) [2,17] compared to alkaline transesterification (around 1 h) [2].