The comparison of different types of acids was conducted
under fixed conditions such as 1% (dosage of acid to LGPO) with a
molar ratio of 10:1 of methanol to LGPO at 60 8C. The selected
acid was added into 150 ml of preheated LGPO at various acid
dosages (0.5%, 1%, and 2%, w/w) in the presence of methanol to
reduce FFA in the LGPO by converting the FFA to FAME.