Modelagem matemática do fator de proteção relativo dos antioxidantes sintéticos em biodiesel comercial

Resumo

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 tert-butylhydroquinone (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 (R2) and adjusted (R2 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.