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ABSTRACT
In this paper, CH3COOH is used to adjust the electrolyte, control different acid concentrations, and use the ·OOH, HBrO, BrO3− produced by the electrolyte on the anode to oxidatively desulfurize the petroleum coke particles suspended in the electrolyte. The desulfurized petroleum coke was analyzed by NB/SH/T 0527–2019 indicators and SEM, TGA, XRD, FTIR, and XPS to explore the degree and regularity of desulfurization conditions on the quality of petroleum coke, and explore the mechanism of the desulfurization process. The experimental results show that the NaBr-CH3COOH system has different desulfurization effects under different acid concentration conditions of pH = 2 ~ 6, and the impact on the quality of petroleum coke is also significantly different. A large acid concentration has a high desulfurization yield of petroleum coke. The desulfurization effect is best at pH = 2, and the desulfurization yield can reach 88.92%, but it has a certain impact on the quality indicators of the petroleum coke industry. The heating value of petroleum coke is slightly reduced, and the volatile content the ash yield content has increased compared with the original coke. The change is mainly due to the scission of the branch, the reduction of carbon atoms due to the oxidation reaction, and other side reactions that occur during the electrolytic oxidation reaction, which makes the oxygen content increase and the combustion performance becomes better. XPS analysis results show that the macromolecular structure of petroleum coke is hardly destroyed. According to the changes of oxygen-containing functional groups and sulfur-containing functional groups on the surface of petroleum coke, the mechanism of petroleum coke desulfurization was preliminarily explored.
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No potential conflict of interest was reported by the author(s).
Additional information
Notes on contributors
Yong Zhang
Yong Zhang is studying postgraduate courses in School of Petrochemical Engineering, Shenyang University of Technology. His research interests include electrochemical desulfurization of petroleum coke and coking coal.
Qi Yu
Qi Yu is an Associate Professor in Shenyang University of Technology. She research interests include desulfurization of gas, liquid, solid products in petroleum processing and fendon kinetics.
Huanhuan Wang
Huanhuan Wang is graduated from Shenyang University of Technology with a bachelor’s degree, In 2020. Currently studying for a master’s degree in the Department of Chemical Engineering, School of Petrochemical Engineering, Shenyang University of Technology. Her research direction is to use electrochemical oxidizer to produce hydrogen peroxide and explore its kinetic equation, and further apply it to the field of electric Fenton.
Mingxu Zou
Mingxu Zou, master, teacher of School of petrochemical industry, Shenyang University of technology, mainly focuses on new chemical materials, energy chemical industry, environmental protection technology and fine chemical product development.