the present invention aims to use a catalyst formulated with 16.67% mgo / koh, 50.00% ceo2 / koh and 33.33% thio2 / koh for the production of a biodiesel with an ester content of 98, 76% and reaction yield of 94.75%. the biodiesel obtained from the optimized mixture of recovered catalysts had an ester content equal to 96.70% (w / w), reaction yield of 94.1% (w / w).
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