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Obtaining biodiesel in subcritical conditions through the conversion of residual frying oil

Abstract:

The residual frying oils contaminate the water by capturing oxygen, which prevents the subsistence of aquatic organisms. This research was developed to recycle and convert these oils into biodiesel. For this purpose, sub critical reaction conditions were obtained by using a prototype of batch reactor with external recirculation, a completely randomized block design was applied (A, B, C), the variables and factors of study were: A molar ratio oil-methanol 1: 6 and 1: 9; B percentage of 0.5% and 1% sodium hydroxide and C reaction temperatures of 160°C, 180°C and 200°C. We obtained 12 combinations of variables that resulted in triplicate 36 experimental units and the reaction time was 10 minutes. When analyzing the biodiesel complies with the ASTM - D1298 quality standard and the combustion analysis, it was determined that for every 1200 ml of Biodiesel combusted in one hour it will decrease: 11700 (mg/m3) of CO, 48% CO2 and 1551 (mg/m3) SO, contributing in this way to reduce environmental pollution.