CO<sub>2</sub> Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation
Recently, membrane contactors have gained more popularity in the field of CO<sub>2</sub> removal; however, achieving high purity and competitive recovery for poor soluble gas (H<sub>2</sub>, N<sub>2</sub>, or CH<sub>4</sub>) remains elusive. Hence, a n...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-06-01
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| Series: | Membranes |
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| Online Access: | https://www.mdpi.com/2077-0375/11/7/496 |
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| author | Sayali Ramdas Chavan Patrick Perré Victor Pozzobon Julien Lemaire |
| author_facet | Sayali Ramdas Chavan Patrick Perré Victor Pozzobon Julien Lemaire |
| author_sort | Sayali Ramdas Chavan |
| collection | DOAJ |
| description | Recently, membrane contactors have gained more popularity in the field of CO<sub>2</sub> removal; however, achieving high purity and competitive recovery for poor soluble gas (H<sub>2</sub>, N<sub>2</sub>, or CH<sub>4</sub>) remains elusive. Hence, a novel process for CO<sub>2</sub> removal from a mixture of gases using hollow fiber membrane contactors is investigated theoretically and experimentally. A theoretical model is constructed to show that the dissolved residual CO<sub>2</sub> hinders the capacity of the absorbent when it is regenerated. This model, backed up by experimental investigation, proves that achieving a purity > 99% without consuming excessive chemicals or energy remains challenging in a closed-loop system. As a solution, a novel strategy is proposed: the pH Swing Absorption which consists of manipulating the acido–basic equilibrium of CO<sub>2</sub> in the absorption and desorption stages by injecting moderate acid and base amount. It aims at decreasing CO<sub>2</sub> residual content in the regenerated absorbent, by converting CO<sub>2</sub> into its ionic counterparts (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mrow><mi>HCO</mi></mrow><mn>3</mn><mo>−</mo></msubsup></mrow></semantics></math></inline-formula> or <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mrow><mi>CO</mi></mrow><mn>3</mn><mrow><mn>2</mn><mo>−</mo></mrow></msubsup></mrow></semantics></math></inline-formula>) before absorption and improving CO<sub>2</sub> degassing before desorption. Therefore, this strategy unlocks the theoretical limitation due to equilibrium with CO<sub>2</sub> residual content in the absorbent and increases considerably the maximum achievable purity. Results also show the dependency of the performance on operating conditions such as total gas pressure and liquid flowrate. For N<sub>2</sub>/CO<sub>2</sub> mixture, this process achieved a nitrogen purity of 99.97% with a N<sub>2</sub> recovery rate of 94.13%. Similarly, for H<sub>2</sub>/CO<sub>2</sub> mixture, a maximum H<sub>2</sub> purity of 99.96% and recovery rate of 93.96% was obtained using this process. Moreover, the proposed patented process could potentially reduce energy or chemicals consumption. |
| first_indexed | 2024-03-10T09:55:27Z |
| format | Article |
| id | doaj.art-244a111e05454563911db4cce2c431bc |
| institution | Directory Open Access Journal |
| issn | 2077-0375 |
| language | English |
| last_indexed | 2024-03-10T09:55:27Z |
| publishDate | 2021-06-01 |
| publisher | MDPI AG |
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| series | Membranes |
| spelling | doaj.art-244a111e05454563911db4cce2c431bc2023-11-22T02:23:18ZengMDPI AGMembranes2077-03752021-06-0111749610.3390/membranes11070496CO<sub>2</sub> Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity LimitationSayali Ramdas Chavan0Patrick Perré1Victor Pozzobon2Julien Lemaire3LGPM, CentraleSupélec, Université Paris-Saclay, SFR Condorcet FR CNRS 3417, Centre Européen de Biotechnologie et de Bioéconomie (CEBB), 3 rue des Rouges Terres, 51110 Pomacle, FranceLGPM, CentraleSupélec, Université Paris-Saclay, SFR Condorcet FR CNRS 3417, Centre Européen de Biotechnologie et de Bioéconomie (CEBB), 3 rue des Rouges Terres, 51110 Pomacle, FranceLGPM, CentraleSupélec, Université Paris-Saclay, SFR Condorcet FR CNRS 3417, Centre Européen de Biotechnologie et de Bioéconomie (CEBB), 3 rue des Rouges Terres, 51110 Pomacle, FranceLGPM, CentraleSupélec, Université Paris-Saclay, SFR Condorcet FR CNRS 3417, Centre Européen de Biotechnologie et de Bioéconomie (CEBB), 3 rue des Rouges Terres, 51110 Pomacle, FranceRecently, membrane contactors have gained more popularity in the field of CO<sub>2</sub> removal; however, achieving high purity and competitive recovery for poor soluble gas (H<sub>2</sub>, N<sub>2</sub>, or CH<sub>4</sub>) remains elusive. Hence, a novel process for CO<sub>2</sub> removal from a mixture of gases using hollow fiber membrane contactors is investigated theoretically and experimentally. A theoretical model is constructed to show that the dissolved residual CO<sub>2</sub> hinders the capacity of the absorbent when it is regenerated. This model, backed up by experimental investigation, proves that achieving a purity > 99% without consuming excessive chemicals or energy remains challenging in a closed-loop system. As a solution, a novel strategy is proposed: the pH Swing Absorption which consists of manipulating the acido–basic equilibrium of CO<sub>2</sub> in the absorption and desorption stages by injecting moderate acid and base amount. It aims at decreasing CO<sub>2</sub> residual content in the regenerated absorbent, by converting CO<sub>2</sub> into its ionic counterparts (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mrow><mi>HCO</mi></mrow><mn>3</mn><mo>−</mo></msubsup></mrow></semantics></math></inline-formula> or <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><msubsup><mrow><mi>CO</mi></mrow><mn>3</mn><mrow><mn>2</mn><mo>−</mo></mrow></msubsup></mrow></semantics></math></inline-formula>) before absorption and improving CO<sub>2</sub> degassing before desorption. Therefore, this strategy unlocks the theoretical limitation due to equilibrium with CO<sub>2</sub> residual content in the absorbent and increases considerably the maximum achievable purity. Results also show the dependency of the performance on operating conditions such as total gas pressure and liquid flowrate. For N<sub>2</sub>/CO<sub>2</sub> mixture, this process achieved a nitrogen purity of 99.97% with a N<sub>2</sub> recovery rate of 94.13%. Similarly, for H<sub>2</sub>/CO<sub>2</sub> mixture, a maximum H<sub>2</sub> purity of 99.96% and recovery rate of 93.96% was obtained using this process. Moreover, the proposed patented process could potentially reduce energy or chemicals consumption.https://www.mdpi.com/2077-0375/11/7/496pH swinghigh puritymembrane contactorCO<sub>2</sub> absorption |
| spellingShingle | Sayali Ramdas Chavan Patrick Perré Victor Pozzobon Julien Lemaire CO<sub>2</sub> Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation Membranes pH swing high purity membrane contactor CO<sub>2</sub> absorption |
| title | CO<sub>2</sub> Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation |
| title_full | CO<sub>2</sub> Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation |
| title_fullStr | CO<sub>2</sub> Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation |
| title_full_unstemmed | CO<sub>2</sub> Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation |
| title_short | CO<sub>2</sub> Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation |
| title_sort | co sub 2 sub absorption using hollow fiber membrane contactors introducing ph swing absorption phsa to overcome purity limitation |
| topic | pH swing high purity membrane contactor CO<sub>2</sub> absorption |
| url | https://www.mdpi.com/2077-0375/11/7/496 |
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