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Dependences of catalyst layer thickness and pellet grading mode on partial oxidation of n-butane
被引:0
作者:
Liu, Xiangkun
[1
]
Khan, Ali Raza
[1
]
Shi, Yao
[1
]
Chen, Wenyao
[1
]
Duan, Xuezhi
[1
]
机构:
[1] East China Univ Sci & Technol, State Key Lab Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China
关键词:
n -Butane partial oxidation;
Catalyst layer thickness;
Pellet grading mode;
Hot spot;
FIXED-BED REACTOR;
MALEIC-ANHYDRIDE;
CFD;
PERFORMANCE;
METHANE;
D O I:
10.1016/j.ces.2024.120235
中图分类号:
TQ [化学工业];
学科分类号:
0817 ;
摘要:
An industrial-scale reactor-pellet coupled model incorporating realistic radial bed voidage is established for nbutane partial oxidation to maleic anhydride (MA) process. Simulation results demonstrate that the reactor packed with CLT-2.75 cylindrical pellets exhibits intense exothermic behavior at the front end of reactor, resulting in the over-oxidation of n-butane within the interior zone of the pellet. Although reducing the thickness of catalyst layers effectively mitigates heat release and prevents n-butane over-oxidation within the pellets' interior zone, pellets with excessively thin catalyst layers would lead to lower n-butane conversion, making the reactor packed with CLT-0.825 pellets exhibiting improved MA selectivity and reduced hot spot temperature. The ultimate optimization of pellet grading with CLT-0.275/1.10 pellets indicates that implementing a temperature sequence characterized by lower temperature at the front end and higher temperature at the back end of the reactor could further notably reduce the hot spot temperature while maintaining a high MA yield.
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页数:11
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