Effect of commercially available antioxidants over biodiesel/diesel blends stability

The main obstacle in biodiesel/conventional diesel blends acceptance worldwide seems to be its poor oxidative stability. Low resistance towards oxygenation is due to the fatty constituent in the blend. Even low concentrations of biodiesel (5%, 10% and 20%) can contribute to sticky, viscous and polymeric deposits formation after several months of storage. Two correlations were derived concerning insolubles formed in both stabilized and not stabilized blends, stressed under conditions of ASTM D2274.For treated with antioxidant additive: Total insol.=0.6561+80.1213∗ΔTAN-114.27∗ΔPC-2.6073∗ΔIVTotal insol.=0.6561+80.1213∗ΔTAN-114.27∗ΔPC-2.6073∗ΔIVFor not stabilized samples: Total insol.=-229.348338-13.2360978∗ΔTAN+968.531862∗ΔVisc.-25.0335999∗ΔIVTotal insol.=-229.348338-13.2360978∗ΔTAN+968.531862∗ΔVisc.-25.0335999∗ΔIVThe correlations’ precision is described by the high value of R2 = 1.0000.Present work proves that it is possible to stabilize such a blend even the fatty component is aged for a period of three months.