Dijkstra rightfully pointed out the typographical errors
in the axes in Fig. 1. Upon further reflection, the slight FFA
increase could be due to the formation of a small amount of
soaps in the reaction, and some of which could be hydrolyzed in the presence of citric acid to form FFA. The data
are reported as obtained from pilot-plant experiments
which cannot be as easily controlled as in laboratory trials.
We cannot explain why the oleic increased and then
appeared to decrease