Itwas found that the optimal reaction conditions are: 1.6wt.% sodiumethoxide, 25 v/v% ethanol and 55 °C,which
allowobtaining a biodiesel composed 100% by ethyl esters that complies with the international quality standards.
On the other hand, it was observed that methanolysis reactions are faster than the ethanolysis and sodium
methoxide catalyst is more active than the corresponding ethoxide, due to the higher steric hindrance of the
ethoxi-radical and to the more intense saponification of sodium ethoxide in ethanol medium.