Modeling and Experimental Studies on Ozone Absorption into Phenolic Solution in a Rotating Packed Bed

Wang, Dan; Liu, Taoran; Ma, Lei; Wang, Feng; Shao, Lei

doi:10.1021/acs.iecr.9b00787

Cited by 22 publications

(5 citation statements)

References 33 publications

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“…Clearly, increasing the high-gravity factor would increase the gas–liquid contact area but decrease the mass transfer resistance due to the decrease of the liquid droplet size and the liquid film thickness in the RPB . The renewal rate of the gas–liquid interface also increases with increasing rotation speed, , which can provide more accessible adsorption sites for aqueous ozone and thus promote the decomposition of ozone into • OH . Both the volumetric mass transfer coefficient and the decomposition rate constant of ozone increase as the rotation speed increases, , resulting in exposure of more ozone and • OH and consequently enhanced degradation of NB.…”

Section: Resultsmentioning

confidence: 99%

“…As the diffusivity of ozone and oxygen in the gas phase is about 104 times higher than that in the liquid phase, the mass transfer of ozone is mainly influenced by the liquid turbulence rather than gas turbulence. As the liquid flow rate increases, the ozone volumetric mass transfer coefficient increases, leading to an increase in the ∫ 0 t [O 3 ] d t and the ozonation rate of NB. High liquid turbulence also contributes to the initiation of • OH in the heterogeneous catalytic system according to the collision theory .…”

Section: Resultsmentioning

confidence: 99%

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Cu–MnO_X/γ-Al₂O₃ Catalyzed Ozonation of Nitrobenzene in a High-Gravity Rotating Packed Bed

Shao

Song

et al. 2021

Ind. Eng. Chem. Res.

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In this study, Cu−MnO X /γ-Al 2 O 3 catalyst was first used for heterogeneous catalytic ozonation of nitrobenzene (NB) in a high-gravity rotating packed bed (RPB), as RPB could significantly improve the mass transfer of ozone and thus contribute to the utilization efficiency of ozone and the degradation of NB. To illuminate the synergistic effect of RPB and heterogeneous catalytic ozonation, the degradation (η NB ) and mineralization (η TOC ) efficiency of NB as well as the utilization efficiency of ozone (Ru) in the RPB/O 3 , BR/O 3 (bubbling reactor), and RPB/O 3 /Cat. processes were compared. The results showed that the η NB and Ru of the RPB/O 3 system were more than twice compared to that of the BR/O 3 system due to the high mass transfer of ozone in the RPB. The use of Cu−MnO X /γ-Al 2 O 3 catalyst as a packing in the RPB/O 3 /Cat. system resulted in an increase in the mineralization of NB from 60.3 to 81.7%. Radical quenching tests confirmed that O 2•− and • OH were dominant reactive oxygen species, and O 2 •− played an important role in • OH generation. In conclusion, Cu−MnO X /γ-Al 2 O 3 -catalyzed ozonation and high gravity had a synergistic effect on • OH initiation and thus improved the degradation and mineralization of NB in an aqueous solution.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Cu–MnO_X/γ-Al₂O₃ Catalyzed Ozonation of Nitrobenzene in a High-Gravity Rotating Packed Bed

Shao

Song

et al. 2021

Ind. Eng. Chem. Res.

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“…VOF model attracts wide interest in many different fields. In terms of flow field, average diameter, velocity of droplets, liquid dispersion angle, and mass transfer process in the rotating packed bed (RPB) reactor have been well examined. − The model captures the air/vapor interface and models in-nozzle cavitation phenomenon in liquid atomization process . In terms of liquid film flow on packings, the VOF model can be utilized to obtain gas–liquid flow fields in a packed bed reactor (PBR) and liquid baffle plate column, with gas and liquid holdup, − film thickness, gas–liquid drag parameters, and the interfacial area calculated with good accuracy.…”

Section: Two/three Phase Flowmentioning

confidence: 99%

Computational Fluid Dynamics Based Modeling of Gas Absorption Process: A State-of-the-Art Review

Liu,

Wang,

Cai

et al. 2024

Ind. Eng. Chem. Res.

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The effective removal of gas phase species relies on effective gas liquid hydrodynamic contact coupling with fast chemical reaction rates. To promote mass transfer rate and the development of reagents, computational fluid dynamic modeling has long been recognized as an effective methodology for the quantification of physical and chemical parameters. The simulation of the gas liquid process involves the coupling of models including multiphase flow, turbulence, interfacial forces, mass transfer, and chemical reactions. The selection of suitable models according to practical applications has been challenging. In terms of multiphase flow, volume of fraction, Euler−Euler, and Euler−Lagrange approaches are discussed. With regard to turbulence, direct numerical simulation, large eddy simulation, and Reynolds averaged Navier−Stokes approach are compared. With respect to interfacial forces, the dominance of drag, lift, virtual mass, wall lubrication, and turbulent dispersion forces for different situations are obtained. In terms of mass transfer, the development and applications of film model, dimensionless analysis, penetration model, and surface renewal model are discussed. Different methodologies to enhance mass transfer include improvement of equipment structure, addition of nanofluid, and exposure to an energy field are summarized. To accelerate the computational process, four methods including the space−time conservation element and solution element model, compartmental model, reduction in dimension, and multiscale approach are discussed. This paper intends to provide a thorough review on the applications of different models to different situations and, in particular, to reveal the restrictions of different models. Overall, this study lays the foundation for future studies on the optimization of scrubbers for large scale practical applications. It also allows a deeper understanding of the interactions of fluid dynamics, mass transfer, and chemical reactions.

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“…In an RPB, small liquid elements like films, filaments, and droplets are obtained by the rotary motion of the rotor, which brings on a large gas–liquid interface area and fast surface renewal frequency, and thus significantly enhances mass transfer and mixing . So far, RPB has been applied in CO 2 absorption and wastewater treatment . A rotating zigzag bed (RZB) is an improved high-gravity device with a zigzag channel in the rotor .…”

Section: Introductionmentioning

confidence: 99%

“…23 So far, RPB has been applied in CO 2 absorption 24 and wastewater treatment. 25 A rotating zigzag bed (RZB) is an improved high-gravity device with a zigzag channel in the rotor. 26 Such a zigzag channel causes a longer gas−liquid contact time and a larger surface renewal rate and thus further enhances the gas−liquid mass transfer compared to RPB.…”

Section: Introductionmentioning

confidence: 99%

Carbon Dioxide Absorption with an Aqueous Biphasic Absorbent in a Rotating Zigzag Bed

et al. 2022

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This study explored an intensive carbon dioxide (CO2) absorption process with aqueous biphasic absorbents containing diethylethanolamine (DEEA) and diethylenetriamine (DETA) in a rotating zigzag bed (RZB). The effects of the absorbent composition on the phase separation behavior and CO2 absorption performance were investigated. The dependence of the overall gas-phase volumetric mass transfer coefficient (K G a) and CO2 absorption efficiency on operating conditions with the DEEA + DETA solution was examined. Experimental results indicated that over 97% absorbed CO2 was focused on the bottom layer in the rich solution. The 4 mol/L DEEA + 1 mol/L DETA and 3.5 mol/L DEEA + 1.5 mol/L DETA solutions had much less volume of the bottom layer compared to absorbents with other compositions. Moreover, it was found that the lean solution flow rate, rotational speed of RZB, and temperature of lean solution had a positive influence on CO2 absorption. The K G a and CO2 absorption efficiency in the RZB with the 3.5 mol/L DEEA + 1.5 mol/L DETA solution reached 4.82 kmol/kPa m3 h and 98.7%, respectively, demonstrating an obvious advantage in CO2 absorption performance compared to the 5 mol/L monoethanolamine solution. An artificial neural network (ANN) model was established to predict K G a and CO2 absorption efficiency. The predicted data and experimental results were in good agreement with the deviations generally less than 10% for K G a and CO2 absorption efficiency. A comparison with a wetted-wall column revealed that the RZB could achieve higher mass transfer efficiency. In addition, the mechanism of phase separation in the DEEA + DETA solution was analyzed. This study demonstrates that the DEEA + DETA solution could be a viable absorbent for CO2 capture in RZB.

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Modeling and Experimental Studies on Ozone Absorption into Phenolic Solution in a Rotating Packed Bed

Cited by 22 publications

References 33 publications

Cu–MnO_X/γ-Al₂O₃ Catalyzed Ozonation of Nitrobenzene in a High-Gravity Rotating Packed Bed

Cu–MnO_X/γ-Al₂O₃ Catalyzed Ozonation of Nitrobenzene in a High-Gravity Rotating Packed Bed

Computational Fluid Dynamics Based Modeling of Gas Absorption Process: A State-of-the-Art Review

Carbon Dioxide Absorption with an Aqueous Biphasic Absorbent in a Rotating Zigzag Bed

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Modeling and Experimental Studies on Ozone Absorption into Phenolic Solution in a Rotating Packed Bed

Cited by 22 publications

References 33 publications

Cu–MnOX/γ-Al2O3 Catalyzed Ozonation of Nitrobenzene in a High-Gravity Rotating Packed Bed

Cu–MnOX/γ-Al2O3 Catalyzed Ozonation of Nitrobenzene in a High-Gravity Rotating Packed Bed

Computational Fluid Dynamics Based Modeling of Gas Absorption Process: A State-of-the-Art Review

Carbon Dioxide Absorption with an Aqueous Biphasic Absorbent in a Rotating Zigzag Bed

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Product

Resources

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Cu–MnO_X/γ-Al₂O₃ Catalyzed Ozonation of Nitrobenzene in a High-Gravity Rotating Packed Bed

Cu–MnO_X/γ-Al₂O₃ Catalyzed Ozonation of Nitrobenzene in a High-Gravity Rotating Packed Bed