Almost total desulfurization of high-sulfur petroleum coke by Na<sub>2</sub>CO<sub>3</sub>-promoted calcination combined with ultrasonic-assisted chemical oxidation

ZHAO Pu-jie; MA Cheng; WANG Ji-tong; QIAO Wen-ming; LING Li-cheng

doi:10.1016/S1872-5805(18)60359-2

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Article Navigation > New Carbon Mater. > 2018 > 33(6): 587-594

ZHAO Pu-jie, MA Cheng, WANG Ji-tong, QIAO Wen-ming, LING Li-cheng. Almost total desulfurization of high-sulfur petroleum coke by Na2CO3-promoted calcination combined with ultrasonic-assisted chemical oxidation. New Carbon Mater., 2018, 33(6): 587-594. doi: 10.1016/S1872-5805(18)60359-2

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ZHAO Pu-jie, MA Cheng, WANG Ji-tong, QIAO Wen-ming, LING Li-cheng. Almost total desulfurization of high-sulfur petroleum coke by Na₂CO₃-promoted calcination combined with ultrasonic-assisted chemical oxidation. New Carbon Mater., 2018, 33(6): 587-594. doi: 10.1016/S1872-5805(18)60359-2

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Almost total desulfurization of high-sulfur petroleum coke by Na₂CO₃-promoted calcination combined with ultrasonic-assisted chemical oxidation

doi: 10.1016/S1872-5805(18)60359-2

1.
State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;
2.
Key Laboratory of Specially Functional Polymeric Materials and Related Technology, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China

Funds: National Natural Science Foundation of China (U1710252, 21506061); Young Elite Scientists Sponsorship Program by CAST; Petro China Innovation Foundation (2015D-5006-0405); Shanghai Rising-Star Program (17QB1401700).

Received Date: 2018-08-19
Accepted Date: 2018-12-27
Rev Recd Date: 2018-09-29
Publish Date: 2018-12-28

Abstract

Abstract

A two-stage desulfurization method for high-sulfur petroleum coke was developed using Na₂CO₃-promoted calcination, followed by ultrasonic-assisted chemical oxidation. Using a Na₂CO₃ to coke mass ratio of 1:4 and an average particle size of 80 μm for the coke, the desulfurization efficiency of the coke reached a maximum of 67.2% using Na₂CO₃-promoted calcination at 900℃ for 2 h with a heating rate of 1℃/min. The total desulfurization after the subsequent ultrasonic-assisted oxidation with nitric acid (65 wt%) reached 93.5% at 80℃ for 12 h using a nitric acid/coke ratio of 20 mL/g. The amounts of sulfur removed by the Na₂CO₃-promoted calcination were 73.4% of the thiophenic sulfur and 59.8% of the sulfoxide, with the total amounts removed after the ultrasonic-assisted oxidation being 93.6 and 93.3% respectively. Na₂CO₃ reacts with H₂S and shifts the chemical equilibrium to remove more sulfur during the calcination. Chemical oxidation converts dibenzothiophenic compounds to water-soluble ones. These jointly increase the desulfurization efficiency of the coke.
- Desulfurization,
- Na₂CO₃-promoted calcination,
- Ultrasonic oxidation,
- High-sulfur petroleum coke

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References(23)

References

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