Citation: HUANG Peng, LI Wen-bo, MAO Xue-feng, ZHAO Peng. Study on suspension bed hydrocracking of medium temperature pyrolytic heavy tar fraction[J]. Journal of Fuel Chemistry and Technology, ;2020, 48(2): 154-161. shu

Study on suspension bed hydrocracking of medium temperature pyrolytic heavy tar fraction

Beijing Coal Chemistry Research Institute, China Coal Research Institute, State Key Laboratory of Coal Mining and Chean Utilization, Key Laboratory of National Energy Coal Utilization and Energy Conservation and Emissions Reduction Technology, Beijing 100013, China

Corresponding author: LI Wen-bo, wenbo-li@126.com
Received Date: 20 December 2019
Revised Date: 16 January 2020

Fund Project: The project was supported by the National Key Research and Development Project 2016YFB0600305the National Natural Science Foundation of China U1610221The project was supported by the National Key Research and Development Project(2016YFB0600305) and the National Natural Science Foundation of China(U1610221)

Figures(18)

The medium temperature pyrolytic coal tar was used as raw material and was analyzed, in which the fraction with boiling point > 350 ℃ that contains the resin of 30.88%, the asphaltene of 37.27% and the tetrahydrofuran insolubles of 3.36% is difficult to hydrocrack directly by conventional fixed bed. A Mo-based ultra-dispersed catalyst was synthesized, and characterized by FT-IR, XPS, XRD, SEM and TEM, etc. The catalyst contains Mo=O and Mo-S characteristic structure and has an excellent dispersibility in the reaction system, and the vulcanization ratio of molybdenum reaches 84.34%. The catalyst can be decomposed into hyper dispersive MoS₂ particle in the reaction system. The suspension bed hydrocracking experiments were carried out in a 0.25 t/d continuous unit with heavy fraction of tar. Moreover, the effects of reaction conditions on product distribution and coking rate were investigated. The optimum reaction conditions were 19 MPa, 440 ℃ and 300 mg/kg of catalyst addition. Under these conditions, the naphtha yield is 24.47%, the diesel fraction yield is 49.71%, and the coking rate is 1.32%.
- ultra-dispersed,
- suspension bed,
- heavy tar frction,
- naphtha,
- coke yield
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