An analysis on catalyst wettability design in strong exothermic reactions

Tang, Yanling; Luo, Gang; Zhou, Zhi; Li, Jianping; Gao, Guoyu; Li, Liquan; Cheng, Zhenmin

doi:10.1016/j.ces.2021.116988

Cited by 1 publication

(1 citation statement)

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“…Due to the high thermal conductivity and large specific heat capacity of the liquid phase, temperature control is much easier compared to the fixed‐bed process. To prevent liquid filling into the catalyst pores which would result in a serious diffusion resistance, the catalyst surface should be modified into a hydrophobic one as reported in the previous work of our research group, 23 so that gas‐phase reaction would occur even the catalyst is surrounded by the liquid, since the hydrophobic surface can prevent liquid from penetrating into the catalyst pores, and the catalyst interior can be completely dry 24 . To realize this concept of three‐phase methanol synthesis under nonwetted condition, it is demanded to establish an external‐loop packed bubble column by loading the catalyst bed in a bubble column, in which the liquid serves as the heat transfer medium.…”

Section: Introductionmentioning

confidence: 99%

Packing size effects on the liquid circulation property in an external‐loop packed bubble column

2022

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Packing size effects on the fluid dynamics in an external-loop packed bubble column with Raschig rings of three different effective diameters (4.9, 14.1, and 40.7 mm) in the riser were investigated. The overall gas holdup, liquid circulating velocity and gas-liquid mass transfer coefficient were respectively measured by volume expansion, tracer-response, and dynamic oxygen-absorption techniques. CFD simulation with the Euler-Euler two-fluid method was used to predict the liquid circulating velocity by treating the packing as a porous medium. Compared to the empty column, the gas holdup was found to increase in the presence of packing, however, the liquid circulating velocity and gas-liquid mass transfer coefficient are rather complicated.Specifically, the gas holdup increases with the decrease of packing size, while the liquid circulating velocity is on the contrary, and the maximal gas-liquid mass transfer coefficient is achieved under packing diameter of 14.1 mm.

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Section: Introductionmentioning

confidence: 99%