The current technologies for biodiesel production are based onhomogeneously catalyzed transesterification under basic conditions(NaOH or KOH). Non-edible jatropha oil consists of high freefatty acids (FFAs) content, is cheaper in prices as compared to edibleoil due to its inferior nutritional value, low market demand andhigh availability. The conventional basic catalysts (NaOH and KOH)are sensitive to high content of FFAs, which led to formation of soapand complicates the product separation as well as reduces thebiodiesel content. Numerous studies have been carried out by usingtwo step acidebase catalyzed reactions. The first acid catalyzedtreatment is used to reduce FFA to <1 wt.% via esterification followedby base catalyzed transesterification of treated oil to highgrade biodiesel. However, the main concerns are the high materialcost (excess methanol), post-treatment cost (multi-purification andwater washing) to remove homogeneous catalyst, additionaltreatment to neutralize the pH for first and second processes.Furthermore, the content of treated oil and final biodiesel productwere reduced during separation and washing step. Thus, the highacid J. curcas oil is not feasible to be employed in conventionalapproach for biodiesel production in view of its incompatibility tothe homogeneous catalysts
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