All the reactions involved in the transesterification
process are equilibrium reactions, making very difficult
the kinetic study. In order to displace the reaction towards formation of the products, the alcohol must be
present in excess in the reaction mixture. Even in this
case, the complete conversion is difficult to be reached.
Since base-catalyzed procedure is the major technique
used for industrial processes for biodiesel production,
we were interested in finding a less expensive and timecosting
method, and ultrasonic irradiation proves to be
a good choice. These advantages reflect in shortening
the reaction time and the quantity of catalyst used with
respect to the yield of isolated product [19].