In the present study, the optimum parameters for producing biodiesel by transesterification of used oil with methanol, using NaOH as a catalyst, were determined. The used oil was collected from poultry farms in the Pichari district. A three-level, four-factor Box-Benhken design with four replicates in the center and the response surface method were used to optimize the conditions of the trans-esterification process. The selected factors were the methanol-oil molar ratio (6, 9, and 12), NaOH concentration (0.5, 1.25, and 2.0), temperature (35, 45, and 55), and reaction time (30, 60, and 90). The selected response was the biodiesel yield. The optimum production conditions were: methanol-oil molar ratio; 9, NaOH concentration; 1.21%; temperature, 57 °C; and time, 62 min at a stirring frequency of 700 rpm. The estimated yield under these conditions was 94%. Three verification tests under th...

Debido al rápido avance de la tecnología computacional de los últimos años, existe en la actualidad un creciente interés de disponer de programas que permitan generar soluciones a los problemas típicos de ingeniería de forma confiable y en el menor tiempo posible. Es por ello que el objetivo principal de este trabajo fue elaborar un software bajo ambiente Windows que permitiera, de manera amigable, sencilla y con una orientación inclusive hacia el área docente, diseñar intercambiadores de calor del tipo: doble tubo, carcasa y tubos y finalmente de placas. El procedimiento de cálculo automatizado, consta de 9 formularios, 1 modulo y 3 DataReport, diseñadas en el lenguaje de programación Visual Basic 6.0, para el diseño térmico de los intercambiadores de calor antes mencionados. El software está hecho como un software abierto, lo que permite el acceso al código fuente, par...

In the present study, the optimum parameters for producing biodiesel by transesterification of used oil with methanol, using NaOH as a catalyst, were determined. The used oil was collected from poultry farms in the Pichari district. A three-level, four-factor Box-Benhken design with four replicates in the center and the response surface method were used to optimize the conditions of the trans-esterification process. The selected factors were the methanol-oil molar ratio (6, 9, and 12), NaOH concentration (0.5, 1.25, and 2.0), temperature (35, 45, and 55), and reaction time (30, 60, and 90). The selected response was the biodiesel yield. The optimum production conditions were: methanol-oil molar ratio; 9, NaOH concentration; 1.21%; temperature, 57 °C; and time, 62 min at a stirring frequency of 700 rpm. The estimated yield under these conditions was 94%. Three verification tests under th...