Transesterification is a complex and cumbersome process [12] and depending on the quality of the feedstock (free fatty acids and water percentage) different steps are necessary. The cost of biodiesel is the major hurdle to its commercialization in comparison to petroleum diesel. The raw material cost, i.e. the cost of the oil feedstock amounts to about 60–70% of the production cost [35] and [36]. The biodiesel production is an expensive process and its cost it also affected by the price of catalysts (expensive and difficult to recover), specific equipment (reactors, centrifuges, separators, etc.) and instrumentation. These drawbacks were also noticed by Atmanli [37] and Agarwal [38]. During the transesterification, it also results in certain by-products such as glycerol which cannot be used as fuel in engines