Carbonic anhydrase textile structured packing for efficient <scp>CO<sub>2</sub></scp> absorption in methyldiethanolamine solvent
Min Xiao, Jesse Thompson, Jialong Shen, Sonja Salmon, Kunlei Liu
Abstract
Abstract Carbonic anhydrase (CA) is an attractive biodegradable catalyst for CO 2 absorption in solvent‐based CO 2 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 CO 2 separation compared with traditional structured packing with a corresponding increased CO 2 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 CO 2 captured.