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Carbonic anhydrase textile structured packing for efficient CO2 absorption in methyldiethanolamine solvent |
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| Authors: | Min Xiao Jesse Thompson Jialong Shen Sonja Salmon Kunlei Liu |
| Affiliation: | 1. Center for Applied Energy Research, University of Kentucky, Lexington, Kentucky, USA;2. Department of Textile Engineering, Chemistry and Science, Wilson College of Textiles, North Carolina State University, Raleigh, North Carolina, USA Contribution: Conceptualization (equal), Investigation (equal), Visualization (equal), Writing - review & editing (equal);3. Department of Textile Engineering, Chemistry and Science, Wilson College of Textiles, North Carolina State University, Raleigh, North Carolina, USA |
| Abstract: | Carbonic anhydrase (CA) is an attractive biodegradable catalyst for CO2 absorption in solvent-based CO2 capture. However, maintaining the stability of CA as a homogeneous component of the solvents is a challenge. Solvent regeneration temperature typically exceeds the enzyme thermal tolerance, which leads to CA deactivation. To reduce the need for frequent CA replenishment and to avoid inactive CA accumulation in the solvent, this work shows the benefits of an immobilization strategy where CA is fixed in a second-generation design of textile structured packing (CATSP-2) modules. The enzyme-immobilized packing showed 1.5 times better performance in CO2 separation compared with traditional structured packing with a corresponding increased CO2 loading in the rich solvent. The modules exhibited good CA activity retention of ~80% during the tests without any CA replenishment. Applying CATSP-2 could potentially decrease the packing height and absorber column size for a lower cost per amount of CO2 captured. |
| Keywords: | carbonic anhydrase CO2 capture enzyme stability immobilization packing |