Acid-catalyzed Transesterification
Acid catalyzed transesterification is very slow compared to base-catalyzed transesterification.
Suitable for oil that has higher FFAs.
This process uses strong acid to catalyze esterification of the FFAs and transesterification of triglycerides.
The process does not produce soap with high FFAs because no metal is present.
Esterification of FFAs is generally faster but produces water.