| 초록 |
Anion exchange membrane (AEM) used in CO2 electrolysis cause crossover of (bi)carbonate ions that originate from CO2 fed into the cathode side. As a result, a gas mixture of CO2 and O2 is released from the anode side, which, harms the economic viability of CO2 electrolysis technology. In order to recover the lost CO2, we design a CO2 recovery plant employing membrane gas separation for the anode side of AEM-based CO2 electrolysis. A membrane module is modeled using Aspen custom modeler, while the overall process is designed and optimized in Aspen Plus. Since the amount of the lost CO2 via crossover varies depending on the current density, we analyze the CO2 recovery cost under various conditions of the anodic effluent. The calculated cost for CO2 recovery is found to be within the range of less than 80$/tCO2, which is the cost for capturing CO2 from a gas mixture with a high concentration. |
