Augmenting CO<sub>2</sub> Absorption Flux through a Gas–Liquid Membrane Module by Inserting Carbon-Fiber Spacers
We investigated the insertion of eddy promoters into a parallel-plate gas–liquid polytetrafluoroethylene (PTFE) membrane contactor to effectively enhance carbon dioxide absorption through aqueous amine solutions (monoethanolamide—MEA). In this study, a theoretical model was established and experimen...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-10-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/10/11/302 |
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| author | Luke Chen Chii-Dong Ho Li-Yang Jen Jun-Wei Lim Yu-Han Chen |
| author_facet | Luke Chen Chii-Dong Ho Li-Yang Jen Jun-Wei Lim Yu-Han Chen |
| author_sort | Luke Chen |
| collection | DOAJ |
| description | We investigated the insertion of eddy promoters into a parallel-plate gas–liquid polytetrafluoroethylene (PTFE) membrane contactor to effectively enhance carbon dioxide absorption through aqueous amine solutions (monoethanolamide—MEA). In this study, a theoretical model was established and experimental work was performed to predict and to compare carbon dioxide absorption efficiency under concurrent- and countercurrent-flow operations for various MEA feed flow rates, inlet CO<sub>2</sub> concentrations, and channel design conditions. A Sherwood number’s correlated expression was formulated, incorporating experimental data to estimate the mass transfer coefficient of the CO<sub>2</sub> absorption in MEA flowing through a PTFE membrane. Theoretical predictions were calculated and validated through experimental data for the augmented CO<sub>2</sub> absorption efficiency by inserting carbon-fiber spacers as an eddy promoter to reduce the concentration polarization effect. The study determined that a higher MEA feed rate, a lower feed CO<sub>2</sub> concentration, and wider carbon-fiber spacers resulted in a higher CO<sub>2</sub> absorption rate for concurrent- and countercurrent-flow operations. A maximum of 80% CO<sub>2</sub> absorption efficiency enhancement was found in the device by inserting carbon-fiber spacers, as compared to that in the empty channel device. The overall CO<sub>2</sub> absorption rate was higher for countercurrent operation than that for concurrent operation. We evaluated the effectiveness of power utilization in augmenting the CO<sub>2</sub> absorption rate by inserting carbon-fiber spacers in the MEA feed channel and concluded that the higher the flow rate, the lower the power utilization’s effectiveness. Therefore, to increase the CO<sub>2</sub> absorption flux, widening carbon-fiber spacers was determined to be more effective than increasing the MEA feed flow rate. |
| first_indexed | 2024-03-10T15:26:00Z |
| format | Article |
| id | doaj.art-cfae8c8451844822a11ebea6fa6f432b |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-10T15:26:00Z |
| publishDate | 2020-10-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Membranes |
| spelling | doaj.art-cfae8c8451844822a11ebea6fa6f432b2023-11-20T18:06:06ZengMDPI AGMembranes2077-03752020-10-01101130210.3390/membranes10110302Augmenting CO<sub>2</sub> Absorption Flux through a Gas–Liquid Membrane Module by Inserting Carbon-Fiber SpacersLuke Chen0Chii-Dong Ho1Li-Yang Jen2Jun-Wei Lim3Yu-Han Chen4Department of Water Resources and Environmental Engineering, Tamkang University, Tamsui, New Taipei 251, TaiwanDepartment of Chemical and Materials Engineering, Tamkang University, Tamsui, New Taipei 251, TaiwanDepartment of Chemical and Materials Engineering, Tamkang University, Tamsui, New Taipei 251, TaiwanDepartment of Fundamental and Applied Sciences, HICoE-Centre for Biofuel and Biochemical Research, Institute of Self-Sustainable Building, Universiti Teknologi PETRONAS, Seri Iskandar, Perak Darul Ridzuan 32610, MalaysiaDepartment of Chemical and Materials Engineering, Tamkang University, Tamsui, New Taipei 251, TaiwanWe investigated the insertion of eddy promoters into a parallel-plate gas–liquid polytetrafluoroethylene (PTFE) membrane contactor to effectively enhance carbon dioxide absorption through aqueous amine solutions (monoethanolamide—MEA). In this study, a theoretical model was established and experimental work was performed to predict and to compare carbon dioxide absorption efficiency under concurrent- and countercurrent-flow operations for various MEA feed flow rates, inlet CO<sub>2</sub> concentrations, and channel design conditions. A Sherwood number’s correlated expression was formulated, incorporating experimental data to estimate the mass transfer coefficient of the CO<sub>2</sub> absorption in MEA flowing through a PTFE membrane. Theoretical predictions were calculated and validated through experimental data for the augmented CO<sub>2</sub> absorption efficiency by inserting carbon-fiber spacers as an eddy promoter to reduce the concentration polarization effect. The study determined that a higher MEA feed rate, a lower feed CO<sub>2</sub> concentration, and wider carbon-fiber spacers resulted in a higher CO<sub>2</sub> absorption rate for concurrent- and countercurrent-flow operations. A maximum of 80% CO<sub>2</sub> absorption efficiency enhancement was found in the device by inserting carbon-fiber spacers, as compared to that in the empty channel device. The overall CO<sub>2</sub> absorption rate was higher for countercurrent operation than that for concurrent operation. We evaluated the effectiveness of power utilization in augmenting the CO<sub>2</sub> absorption rate by inserting carbon-fiber spacers in the MEA feed channel and concluded that the higher the flow rate, the lower the power utilization’s effectiveness. Therefore, to increase the CO<sub>2</sub> absorption flux, widening carbon-fiber spacers was determined to be more effective than increasing the MEA feed flow rate.https://www.mdpi.com/2077-0375/10/11/302carbon dioxide absorptionMEA solventmass transferSherwood numbermembrane contactorconcentration polarization |
| spellingShingle | Luke Chen Chii-Dong Ho Li-Yang Jen Jun-Wei Lim Yu-Han Chen Augmenting CO<sub>2</sub> Absorption Flux through a Gas–Liquid Membrane Module by Inserting Carbon-Fiber Spacers Membranes carbon dioxide absorption MEA solvent mass transfer Sherwood number membrane contactor concentration polarization |
| title | Augmenting CO<sub>2</sub> Absorption Flux through a Gas–Liquid Membrane Module by Inserting Carbon-Fiber Spacers |
| title_full | Augmenting CO<sub>2</sub> Absorption Flux through a Gas–Liquid Membrane Module by Inserting Carbon-Fiber Spacers |
| title_fullStr | Augmenting CO<sub>2</sub> Absorption Flux through a Gas–Liquid Membrane Module by Inserting Carbon-Fiber Spacers |
| title_full_unstemmed | Augmenting CO<sub>2</sub> Absorption Flux through a Gas–Liquid Membrane Module by Inserting Carbon-Fiber Spacers |
| title_short | Augmenting CO<sub>2</sub> Absorption Flux through a Gas–Liquid Membrane Module by Inserting Carbon-Fiber Spacers |
| title_sort | augmenting co sub 2 sub absorption flux through a gas liquid membrane module by inserting carbon fiber spacers |
| topic | carbon dioxide absorption MEA solvent mass transfer Sherwood number membrane contactor concentration polarization |
| url | https://www.mdpi.com/2077-0375/10/11/302 |
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