RESUMEN El presente trabajo muestra los resultados de la obtencion de un biodiesel a partir de aceites vegetales usados por medio de la transesterificacion con el alcohol etilico a escala laboratorio. Se confirmo que el mejor catalizador es de tipo basico (NaOH y KOH) y las condiciones mas adecuadas de relacion molar alcohol / AVU son (3,6-9:1) y la relacion de catalizador / aceite es de (0,2-0,8) % w/w NaOH/ AVU, a 77 °C, con tiempos de reaccion de 2 horas. En el trabajo se purificaron y caracterizaron las mezclas de Etil-esteres obtenidos utilizando espectros de infrarrojo para su identificacion. Palabras Claves: Aceites Vegetales Usados (AVU), Etanol, Transesterificacion, Etil- Esteres (biodiesel) ABSTRACT The following report shows the results from the production of a biodiesel from waste vegetable oils, by means of transesterification with ethyl alcohol at a lab scale. It was demonstrated that the best catalyst is of Basic nature (NaOH and KOH) and the most adequate conditions of molar alcohol/AVU ratio are (3.6-9:1) and a ratio of catalyst to oil of (0.2-0.8)% w/w NaOH/AVU at 77 °C, with a reaction time of two hours. In the report the obtained ethyl ester mixtures were purified and characterized using Infrared spectra for its identification. Keywords: Used vegetal oils, Ethanol, Transesterification, Ethyl -Esters (biodiesel)