The theoretical yield (defined as mass of biodiesel obtained/
mass of oil fed) expected in the ethyl ester production process is
105.22%; however, both methyl and ethyl esters were obtained,
since methanol was fed to the reactor as part of the solution containing
the catalyst. The theoretical amount of methyl esters
formed taking into account the amount of methanol introduced
with the catalyst solution, and assuming that 100% of this alcohol
was transformed into esters, corresponds to 24.5% of methyl esters
in the final biodiesel.