Biodiesel can replace diesel because it possesses similar physicochemical properties and has many advantages. However, this biofuel, due to the nature of the raw material used in its production, is susceptible to oxidation, hence the need to apply antioxidant substances. The antioxidant options and varieties are many, but synthetic antioxidants like tertbutylhydroquinone (TBHQ), butylhydroxyanisole (BHA) and butylhydroxytoluene (BHT) are the most widely used. The aim of the present work was to present multiple linear regression mathematical models to express the antioxidant protection capacity of the oxidation reaction through the relative protection factor, using as independent variables the biodiesel compliance parameters. These models were suitable for predictive purposes with coefficients of determination (R 2) and adjusted (R 2 aju) varying between 0.88 and 0.93 and values of p lower than 0.05 besides the low dispersion between the predicted and observed values. Through the level curves, using the most significant independent variables, it was possible to analyze the behavior of the relative protection factor. The optimization of the mathematical models, containing only the significant terms, presented FPR of 120.11 for TBHQ, 30.05 for BHT and 41.52 for BHA.
Biodiesel is a biofuel produced by the esterification reaction. It is an option to replace fossil fuels, mainly diesel, due to its similar physical and chemical properties. In this research, a mathematical modeling was performed to predict the antioxidant mass to be added in a commercial biodiesel to achieve the minimum oxidative stability provided by the legislation. An equation for each additive was proposed, with the mass of these antioxidants considered as dependent variables and the conformity parameters as independent ones, obtaining multiple regression equations without intercept. The BHA and BHT antioxidants were used. The equations provided were lower at the 5% level and presented determination coefficients (R²) equal to 0.9790 and 0.9770 for the BHA and BHT, respectively, proving their predictability ability and also showing that they can be used to estimate the antioxidant mass to be added in a biodiesel to reach the current regulations.
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