Liquid dispersion behaviors in a rotating packed bed with different packing arrangements: A comparison study

Xu, Han-Zhuo; Liu, Zhi-Hao; Li, Yan-Bin; Zhang, Liang-Liang; Chu, Guang-Wen; Chen, Jian-Feng

doi:10.1016/j.ces.2024.120054

Cited by 4 publications

(8 citation statements)

References 40 publications

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“…Bubble characteristic parameters are measured by an M2 single-tip optical probe (A2 Photonic Sensor, France). 33 The optical probe has been widely employed to determine bubble characteristics in bubble columns 34 and stirred tank reactors. 11 The measurement system and position of the M2 probe are depicted in Figure 1.…”

Section: Methodsmentioning

confidence: 99%

“…19,23 The probe direction was along the tangential direction of the rotating packing, ensuring the probe tip pierced bubbles in the normal direction of the incoming bubbles surface. 33 The emission and reception of laser signals were achieved by a laser module. Figure 2 presents the signal evolution of the probe during detection of a bubble.…”

Section: Methodsmentioning

confidence: 99%

“…The signal rose higher when the probe tip was surrounded by gas. The local gas holdup (ε G ) was formulated as the proportion of all (n) bubble durations (∑ i = 1 n t i ) in the whole experiment duration (t) 33,35…”

Section: Methodsmentioning

confidence: 99%

“…The oscillatory signal was detected when a bubble was contacted and was pierced by the probe. The frequency (f) of the oscillations was directly proportional to the bubble velocity (v i ), which determined the average velocity (v) of bubbles 33,34…”

Section: Methodsmentioning

confidence: 99%

“…The definition of the packing mesh number is illustrated by Figure S1 in the Supporting Information. Bubble characteristic parameters are measured by an M2 single-tip optical probe (A2 Photonic Sensor, France) . The optical probe has been widely employed to determine bubble characteristics in bubble columns and stirred tank reactors .…”

Section: Methodsmentioning

confidence: 99%

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Local Gas Holdup, Bubble Size Distribution, and Bubble Velocity in a Submerged Rotating Packed Bed Reactor

Yang,

Xu,

et al. 2024

Ind. Eng. Chem. Res.

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Rotating packed bed (RPB) commonly generates tremendous centrifugal force to disperse the liquid phase and promote mass-transfer processes. However, plenty of chemical processes, such as oxidation and fluorination, featuring dispersed gas and continuous liquid, exist in the chemical industry. The gas-dispersed systems possessed low gas/liquid ratios, and the liquid residence time and operating mode of conventional RPBs cannot meet such reaction needs. Herein, a submerged RPB was developed for gas-dispersed systems. The stainless-steel wire mesh packing was immersed in liquid, while gas was dispersed and cocurrently flowed with liquid through the rotating packing. Hydrodynamic characteristics of the gas dispersion performance were then investigated by optical probe measurements. Results indicated that local gas holdup (0.85−5.42%) was proportionally correlated to the gas flow rate. Bubble size conformed to the log−normal distribution with a standard deviation in ranges of 0.59−1.17. With the elevation of rotational speed and diminishment of aeration rate, Sauter mean diameter of bubbles (d 32 , 1.49−5.51 mm) was decreased, and the average velocity of bubbles (v, 0.56−1.85 m/s) was increased. In a 0.05% ethanol−water solution, bubble coalescence probability could be reduced, and the bubble size was 20.2% smaller than that in water. Correlations to predict d 32 and v were established with deviations less than ±20 and ±15%, respectively.

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Section: Methodsmentioning

confidence: 99%