Pyrolysis Products Formation Characteristics and Kinetics of Heavy Oil Base Cracked Oil

In this study, the pyrolysis products formation and kinetics of base cracked oil were studied by a TG-FTIR device, which can provide a reference basis for heavy oil and gas reaction and industrial application. The results exhibited that the saturated fraction was mainly composed of chain alkanes and cycloalkanes. The aromatic fraction mainly contains polycyclic aromatic hydrocarbons and alkyl substituted aromatic hydrocarbons. The resin fraction is mainly multi-cyclic aromatic hydrocarbons. As the fraction becomes heavier, the initial and termination cracking temperature of saturate, aromatic, the amount of carbon residue gradually increases and coking intensifies. The pyrolysis products of chemical group were mainly methane, ethylene, C2+ hydrocarbons, and light aromatics, and the main contributing components for the generation of low carbon olefins are the saturated and aromatic fractions. The correlation coefficients R2 of the linear equations and fitting results were close to 1, and thus proving that the selected model was reasonable. The saturate fraction had the lowest activation energy of 78.82 kJ∙mol-1, while the aromatic, resin, and asphaltene have activation energies of 103.46 kJ∙mol-1, 108.87 kJ∙mol-1, and 110.56 kJ∙mol-1, respectively.