Abstract

LOPEZ, Luisa; BOCANEGRA, Jenny  and  MALAGON-ROMERO, Dionisio. Production of Biodiesel from Waste Cooking Oil by Transesterification. Ing. Univ. [online]. 2015, vol.19, n.1, pp.155-172. ISSN 0123-2126.  https://doi.org/10.11144/Javeriana.iyu19-1.sprq.

Evaluating different vegetable oils in order to obtain biofuels, reducing production costs, increasing reaction yield, avoiding raw materials considered as foods and reducing environmental pollution has become a global strategy and trend for the production of biodiesel. In this study, the production of biodiesel from waste cooking oil (WCO) was analyzed using alkali catalyzer. We evaluated three molar ratios of methanol:oil, those are 6:1, 9:1 and 12:1; two catalysts KOH and NaOH; and two percentages of the catalysts, 1% and 2%. A factorial design of experiments was performed in duplicate. The temperature was fixed at 60°C and the reaction time was two hours. Gas chromatography was used to determine the content of methyl esters, mono, di and triglycerides. The best conditions for both NaOH and KOH as catalysts were obtained when the percentage of the catalyst was 1%, and when the alcohol: oil molar ratio was 12:1. Under these conditions, a conversion of 64.1%, a yield of 98% and a methyl ester of 99,1% were reached for the NaOH catalyst. For KOH, the conversion was 63.2%, the yield 88% and the percentage of methyl esters about 98.4%. The results of this study reveal high yield of the reaction for WCO as raw material. Consequently its implementation at industrial scale will be depended of the economic evaluation.

Keywords : biodiesel; transesterification; wasted oil; alkaline catalyst.

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