Monitoramento das propriedades dos biodíeseis metílicos de soja puro, aditivado e comercial, sob condições de estocagem ao relento em recipientes de aço-carbono

Abstract

<p>The Increasing global demand for liquid fuels, global warming, security and energy stability, political will for development in the fields of agriculture, social and energy as well as the search for additives that improve the stability and storage of them are points that show the need for the development of new technologies for the production of biodiesel from various agricultural crops spread throughout many countries. In this sense , the objective of this study was to investigate the pure biodiesel and biodiesel with the addition of antioxidants, evaluating the physical, chemical, fluid dynamics, water content and susceptibility to commercial biodiesel oxidation. Methyl soybean biodiesel was obtained in its commercial form (with the addition of antioxidant, BSA100 - TBHQ) and in its pure form (without the addition of antioxidant, BS100) and pure (with the addition of natural antioxidants, BSM50 - 50% biodiesel of pure soybean (50% pure bioda), BS100-13 and BS100- 14 - Syrah grape extract additive and Petit Verdot, respectively. Gas Chromatography identified the soybean methyl biodiesel, verifying the existence of 50.41%, referring to the methyl linolenate that sensibly influences its susceptibility in the oxidation process. Physical and chemical characterizations were performed, based on the following parameters: acidity index, specific mass and kinematic viscosity, showing values within the limit established by ANP Resolution no. 14/2012. With increasing storage time, there was a huge increase in the water content of biodiesel well above the limit (350 ppm). The additives caused an increase in the oxidation stability value. After 30 days of storage in carbon steel jars, soybean methyl biodiesel will no longer meet ANP regulations.</p>