Analysis of Equilibrium-Based TSA Processes for Direct Capture of CO2 from Air

Direct capture of CO2 from air is a concept that, if successfully implemented, could lead to capture of CO2 from disperse sources. We have developed process models to consider the viability of adsorption-based air capture technologies. Our models focus on using an amino-modified silica adsorbent, TRI-PE-MCM-41, and a structured monolithic contactor unit. We have studied several different temperature swing adsorption processes using the purity of CO2 and annual product throughput as metrics for comparing process performance. This analysis identifies some of the operational parameters, adsorbent characteristics, and other factors that have a significant effect on the performance of the process. Using the total energy requirement of the process and available sources of energy, such as low pressure steam and electricity, we carry out an economic analysis to obtain a net operating cost for air capture of CO2. We identify a process with a daily throughput of ∼1.1 t CO2 at 88.5% purity using standard shipping co...

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