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Optimization for producing biodiesel from ethanol and waste frying oil with a high concentration of ester Translated title: Optimización de la producción de biodiesel con etanol y aceite residual de freír con un alto contenido de éster

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      Abstract

      The usual transesterification of waste frying oil with ethanol does not give final concentration of biodiesel above 96.5%. The aim of this paper is to optimize the reaction conditions using ethanedioic acid as an activator of the carbonyl glyceryl ester. With the aid of a factorial design, the effects of the molar ratio of ethanol and oil, as well as the concentration of the catalyst sodium hydroxide were evaluated. The oil used was dehydrated and filtered, and the reactants submitted to mechanical stirring for two hours at 70° C. The data have been modeled by applying the response surface methodology, for the optimal reaction conditions. As results, the presence of ethanedioic acid drives transesterification from waste frying oil giving biodiesel with ester content over 96.5%. The response surface methodology gave the optimum conditions for the production of ethyl esters at molar ratio ethanol:oil of 6:1 and sodium hydroxide content of 1% relative to the mass of oil.

      Translated abstract

      Considerando que la transesterificación del aceite residual como resultado de la cocción de alimentos con la presencia de etanol no permite obtener biodiesel con concentración de etil éster superior a 96,5%, esta investigación muestra cómo se optimizaron las condiciones de la reacción con la adición de ácido oxálico. Con la ayuda de un diseño factorial fueron estudiados los efectos de la relación molar de etanol y aceite, así como la concentración del catalizador hidróxido de sodio en la presencia de ácido oxálico como activador del carbonilo en la fase aceite. El aceite usado se deshidrató y se filtró. La reacción fue realizada mediante la agitación mecánica durante un período de dos horas a 70° C. Los datos fueron modelados mediante la aplicación de la metodología de superficie de respuesta, encontrando las condiciones óptimas de la reacción. El camino propuesto demostró ser factible para la producción de biodiesel a partir de etanol y aceite residual con contenido de éster dentro de la concentración especificada por EN 14103 (superior a 96,5%). La metodología de superficie de respuesta mostró las condiciones ideales con la relación molar etanol:aceite de 6:1 y contenido de hidróxido de sodio de 1% respecto a la masa del aceite.

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      Most cited references 31

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      Variables affecting the yields of fatty esters from transesterified vegetable oils

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        Biodiesel production from waste cooking oil: 2. Economic assessment and sensitivity analysis.

        The economic feasibilities of four continuous processes to produce biodiesel, including both alkali- and acid-catalyzed processes, using waste cooking oil and the 'standard' process using virgin vegetable oil as the raw material, were assessed. Although the alkali-catalyzed process using virgin vegetable oil had the lowest fixed capital cost, the acid-catalyzed process using waste cooking oil was more economically feasible overall, providing a lower total manufacturing cost, a more attractive after-tax rate of return and a lower biodiesel break-even price. On the basis of these economic calculations, sensitivity analyses for these processes were carried out. Plant capacity and prices of feedstock oils and biodiesel were found to be the most significant factors affecting the economic viability of biodiesel manufacture.
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          A review on biodiesel production using catalyzed transesterification

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            Author and article information

            Affiliations
            orgnameCentro Universitário SOCIESC - UNISOCIESC gouvea@ 123456sociesc.org.br
            Joinville orgnameCentro Universitário SOCIESC - UNISOCIESC Brazil
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Journal
            rfiua
            Revista Facultad de Ingeniería Universidad de Antioquia
            Rev.fac.ing.univ. Antioquia
            Facultad de Ingeniería, Universidad de Antioquia (Medellín, Antioquia, Colombia )
            0120-6230
            June 2016
            : 0
            : 79
            : 185-191
            S0120-62302016000200017
            10.17533/udea.redin.n79a17

            This work is licensed under a Creative Commons Attribution 4.0 International License.

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            Figures: 0, Tables: 0, Equations: 0, References: 31, Pages: 7
            Product
            Product Information: SciELO Colombia

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