the addition of an excess amount of catalyst gave rise to the formation of an emulsion which in turn led to the formation of gels and a decreased % of ethyl ester. This result differed from that of Kulkarni et al. (2007) who employed an alkaline catalyst of 0.7 %wt of KOH/oil for producing ethyl ester from used canola oil by a transesterification process. Part of this difference may be attributed to differences in the raw material used, as well as the amount of alkaline catalyst needed to neutralize the acid catalyst in the esterification product (Ghadge and Raheman, 2005).