ethylesters.
In order to obtain lower values of acidity at the end of the
esterification, a higher ethanol concentration should be used
(Knothe, 2004). Nevertheless, since this stream is recycled and
mixed with the crude oil, its acid value is not relevant, as long as
it is in the order of 5 or lower because of the low impact on the
acidity of the crude oil stream due to the low relative mass of
the esterified stream compared to the crude oil stream.