Infl uential factors on the oxidation stability of biodiesel: statistical study

Abstract

• In this study the effect of the level of 
oxygen pressure, the concentration of 
antioxidant and the type of biodiesel 
on the oxidative stability of the 
material have been measured. An 
experimental design was performed 
considering two types of biodiesel, 
various pressures of oxygen and 
additions of a commercial antioxidant. 
As a response variable was chosen 
Oxidation Onset Temperature (OOT), 
measured by Pressure Differential 
Scanning Calorimetry (PDSC). It has 
been found that the design that best 
fi ts the data is the replicated main 
effects model with three treatment 
factors. The sequence of factors, 
sorted in descending order according 
to their infl uence in the OOT resulted 
to be: Pressure > Type of biodiesel > 
Antioxidant. It has been also observed 
an interaction by mixing 50% by 
weight of the two types of biodiesel, 
which produces some deviation from 
the expected linear behaviour.