Avaliação da ação antioxidante de produtos naturais no biodiesel B100 (Glycine max)

• Autor(a) principal: Oliveira, Ricardo Sonsim de
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações do UNIOESTE
• Texto Completo: http://tede.unioeste.br:8080/tede/handle/tede/1806
• topic: Aditivos; Saburá; Biocombustível; Inibidores; Additives; Saburá; Biofuel; Inhibitors; CNPQ::ENGENHARIAS::ENGENHARIA QUIMICA::TECNOLOGIA QUIMICA

One of the factors that cause concern to producers and retailers of biodiesel is the easy degradation of this compound, since it can have a lifetime of very small due to its low oxidation stability. Thus the present study aimed to test non-synthetic compounds as antioxidants in B100 biodiesel obtained from soybean oil. Specific objectives were to evaluate the oxidative stability of biodiesel B100 with different types of alcoholic extracts and substances in nature that could indicate possible potential antioxidation, including: Peppermint, Rosemary, Yerba Mate, and Candeia Sabura. Some of the substances were tested in nature and other alcoholic extractions were performed. The methodology used was called Rancimat equipment, a device which simulates the two main parameters that affect the oxidation stability of biodiesel, which is the action of high temperatures and the presence of oxygen, which has resulted in an induction period due the time in hours. Preliminary tests were performed at two concentrations 1000ppm (0.1%) and 5000 ppm (0.5%) in the search for an antioxidant compound, and after the tests in aditivações rancimat had significant results only extract Mint (3.9 h) Sabura and fresh (13.87 h). Compared to pure biodiesel (2.56 h) and mint extract Sabura 0.5% concentration had the greatest potential against oxidation, but only Sabura met the specifications of the technical standards of ANP over the induction period. After preliminary testing assays were performed with the oxidation of biodiesel Rancimat to evaluate the effect of antioxidant concentration of the Sabura (natural) from two different regions and the synthetic antioxidant TBHQ at five different concentrations (0.10%, 0.25%, 0.50%, 1.00% and 2.00%). effect of concentration for the natural antioxidant (Sabura) of the western and northwestern Paraná and synthetic (TBHQ) were similar, indicating a growth in the antioxidant potential to 5000ppm and the concentration from this amount the antioxidant capacity of these compounds were being lost starting to act as oxidation catalysts. There was the influence of the origin of the antioxidant potential Sabura where Sabura the Northwest of Paraná filed an induction period (13 64h) the best concentration measured since the Sabura the western Paraná showed an induction period of (7.38 h), both attended the norm of ANP. The survey results showed that the sample improved stability to oxidation at 110 ° C was obtained from the antioxidant Sabura the Northwest of Paraná (from the pollen collected by bees Jataí (Tetragonista angustula) with a concentration of 0.5% (5000ppm) (13.64 h). the worst case was the alcoholic extract mate with a concentration of 0.1% (1000ppm) (1.38 h). Thus, it is concluded that the Sabura can be considered an antioxidant second ANP, the official standard for determining the oxidative stability in accelerated test (EN 14112, 2003).