Falling liquid-film on hydrophilic porous ceramic membrane for boosting CO2 absorption

Qi, Wenbo; Fu, Kaiyun; Chen, Xianfu; Qiu, Minghui; Fan, Yiqun

doi:10.1016/j.seppur.2022.122238

Cited by 7 publications

(9 citation statements)

References 29 publications

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“…Alternatively, absorption processes that do not rely on hydrophobic pore-based membranes may be considered 24 . Using a hydrophilic porous membrane for CO 2 absorption into aqueous solutions in a falling liquid-film mode is a novel approach that shows promise 25 . In this mode, the feed liquid permeates through the hydrophilic porous membrane pores, forming a falling liquid film on the surface of the permeation side of the membrane due to gravity.…”

Section: Introductionmentioning

confidence: 99%

Efficient CO2 absorption through wet and falling film membrane contactors: insights from modeling and simulation

Ghasem

2023

Sci Rep

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The release of excessive carbon dioxide (CO2) into the atmosphere poses potential threats to the well-being of various species on Earth as it contributes to global working. Therefore, it is necessary to implement appropriate actions to moderate CO2 emissions. A hollow fiber membrane contactor is an emerging technology that combines the advantages of separation processes and chemical absorptions. This study investigates the efficacy of wet and falling film membrane contactors (FFMC) in enhancing CO2 absorption in a monoethanolamine (MEA) aqueous solution. By analyzing factors such as membrane surface area, gas flow rate, liquid inlet flow rates, gas–liquid contact time, and solvent loading, we examine the CO2 absorption process in both contactors. Our results reveal a clear advantage of FFMC, achieving an impressive 85% CO2 removal efficiency compared to 60% with wet membranes. We employ COMSOL Multiphysics 6.1 simulation software and finite element analysis to validate our findings, demonstrating a close agreement between predicted and experimental values, with an average relative error of approximately 4.3%. These findings highlight the significant promise of FFMC for applications in CO2 capture.

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Section: Introductionmentioning

confidence: 99%

Efficient CO2 absorption through wet and falling film membrane contactors: insights from modeling and simulation

Ghasem

2023

Sci Rep

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“…Validation of 2 removal ux and e ciency against gas ow rate using a model. The experimental data used in this validation are cited in reference 22 .…”

Section: Declarations Data Availabilitymentioning

confidence: 99%

“…Using a hydrophilic porous membrane for CO2 absorption into aqueous solutions in a falling liquid-lm mode is a novel approach that shows promise 20 . In this mode, the feed liquid permeates through the hydrophilic porous membrane pores, forming a falling liquid lm on the surface of the permeation side of the membrane due to gravity.…”

Section: Introductionmentioning

confidence: 99%

“…The hydrophilic and porous properties of the membrane pores allow for high permeate ux of aqueous amine solution and good dispersion of the permeate liquid, providing a high effective gas-liquid contact area for the falling liquid lms. In theory, the falling liquid lm should be able to completely cover the surface of the permeate side of a hydrophilic porous membrane 22 . While some operational issues may prevent the formation of a completely falling liquid lm, such as an inclined membrane tube or liquid gathering during down ow, the porous membrane still provides a minimum level of coverage depending on its porosity.…”

Section: Introductionmentioning

confidence: 99%

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Efficient CO 2 Absorption through Wet Membrane Falling Film Contactors: Insights from Modeling and Simulation

Ghasem

2023

Preprint

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This study investigates the use of wet membrane falling liquid film contactors to enhance the absorption of carbon dioxide (CO2) in a monoethanolamine (MEA) aqueous solution. Simulation and modeling analysis were performed to assess the effectiveness of the contactors in capturing CO2. The study analyzed the membrane surface area, flow rates, gas-liquid contact time, and solvent loading to investigate the CO2 absorption process in a falling film membrane contactor (FFMC). The results show that using FFMC significantly increases the CO2 capture rate compared to wet membranes. The study provides valuable insights into the use of contactors for CO2 capture and can serve as a basis for further research in this field. The study employed the finite element analysis method-based COMSOL Multiphysics 6.1 simulation software to conduct a numerical simulation of the CO2 mass transfer process in the FFMC system. The simulation model's accuracy was tested by comparing the simulated CO2 absorption efficiency and flux values in the MEA solution with experimental data. The results showed a favorable agreement between the predicted and experimental values, with an average relative error of approximately 4.3%. These findings suggest that the falling film membrane contactor approach holds significant potential for commercial applications in CO2 capture.

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“…In addition, gas-liquid systems require attention to the choice of absorbent. At present, amine solvents are the most studied CO 2 absorbents [23][24][25][26][27]. Although the carbon capture rate of amine solvents is high, the amine desorption process has the problems of high cost, high energy consumption, and low economic efficiency [28,29].…”

Section: Introductionmentioning

confidence: 99%

Carbon Capture from Flue Gas Based on the Combination of Non-Contact Hydrophobic Porous Ceramic Membrane and Bubbling Absorption

Luo¹,

Jin²,

Zhang³

2023

Journal of Renewable Materials

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A hybrid system combined with a non-contact membrane and bubbling absorption is proposed to capture CO 2 from flue gas. The non-contact way of membrane and liquid absorbent effectively avoids the reduction of gas diffusion flux through the membrane. High-porosity ceramic membranes in hybrid systems are used for gas-solid separation in fuel gas treatment. Due to the high content of H 2 O and cement dust in the flue gas of the cement plant, the membrane is hydrophobically modified by polytetrafluoroethylene (PTFE) to improve its anti-water, anti-fouling, and self-cleaning performances. The results show that the diffusion flux of CO 2 through the membrane is still higher than 7.0 × 10 −3 mol/m 2 s (20% CO 2 concentration) even under the influence of water and cement dust. In addition, slaked lime selected as the absorbent is cheap and the product after bubbling absorption is nano-scale light calcium carbonate. To sum up, the hybrid system combining non-contact membrane and bubbling absorption is expected to be used to capture carbon dioxide from the flue gas of the cement plant.

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Falling liquid-film on hydrophilic porous ceramic membrane for boosting CO2 absorption

Cited by 7 publications

References 29 publications

Efficient CO2 absorption through wet and falling film membrane contactors: insights from modeling and simulation

Efficient CO2 absorption through wet and falling film membrane contactors: insights from modeling and simulation

Efficient CO 2 Absorption through Wet Membrane Falling Film Contactors: Insights from Modeling and Simulation

Carbon Capture from Flue Gas Based on the Combination of Non-Contact Hydrophobic Porous Ceramic Membrane and Bubbling Absorption

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