Thermal behavior and kinetics of crude oils at low heating rates by differential scanning calorimeter

The objective of this research was to investigate thermal behavior and kinetics of different origin crude oils in limestone matrix by differential scanning calorimeter (DSC) at low heating rates. In DSC experiments, three distinct reaction regions were identified in all of the crude oil + limestone mixtures known as low temperature oxidation (LTO), fuel deposition (FD) and high temperature oxidation (HTO) respectively. Kinetic analysis of the crude oil samples was determined by different models known as ASTM, Borchard-Daniels and Ozawa. Higher activation energy values were obtained in high temperature oxidation region.

► In combustion with air, three transitional stages are detected at each heating rate. ► Higher heat of reactions and temperatures were seen as heating rate is increased. ► Activation energy of the crude oils were close to each other in all the models.