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.
引用
收藏
页数:11
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