Investigation on the oxidation thermal effects and kinetics of multivariate mixtures of heavy oil SARA fractions

Abstract

This work aims to investigate the oxidative exothermic effects and kinetics of multivariate mixtures of SARA fractions. The results showed that compared to other mixtures, the high temperature combustion (HTC) mass loss of the ternary mixture (S + R + A2) was the highest (22.46%), and it has the most considerable HTC heat release of 2.044 kJ/g. Aromatics could reduce the heat enthalpy and change the activation energy of ternary mixtures (S + A1 + R, S + A1 + A2) in the low temperature oxidation (LTO) and HTC stages. The oxidation reactivity of multivariate mixture formulated based on the ratio of heavy oil SARA fractions was improved by the interactions between SARA fractions.

Keywords:

• heavy oil
• kinetics
• multivariate mixtures
• oxidative exothermic effects
• SARA fractions

Acknowledgments

The authors thank the Petrochina Xinjiang Oilfield Company for the heavy crude oil supply for this research and permission to publish this article. The authors acknowledge financial support from the Natural Science Foundation of Shandong Province (ZR2021ME006), the Opening Fund of Shandong Key Laboratory of Oilfield Chemistry, and the Fundamental Research Funds for the Central Universities (19CX05006A). As well, this work was supported by the Ministry of Science and Higher Education of the Russian Federation under agreement No. 075-15-2020-931 within the framework of the development program for a world-class Research Center “Efficient development of the global liquid hydrocarbon reserves”. The authors also thank the anonymous reviewers for their valuable comments.