Direct Air Capture Using Aqueous Amino Acid Solvents in a Crossflow Absorber
Jorge Gabitto, Abishek Kasturi, Gyoung Gug Jang, Radu Custelcean, Costas Tsouris
TL;DR
This paper studies using crossflow absorbers with amino acid solvents to capture CO2 from the air more efficiently.
Contribution
The paper modifies a theoretical model to simulate crossflow DAC absorbers and provides design suggestions for efficient CO2 capture.
Findings
Crossflow absorbers are better for large air and solvent flow rates due to lower pressure drops.
The modified model helps predict process efficiency based on geometric and operational parameters.
Design suggestions are provided to improve DAC process efficiency.
Abstract
Carbon dioxide (CO2) is the most abundant of all greenhouse gases (GHGs). CO2 levels in the atmosphere are 50% higher than in the preindustrial era, trapping heat. CO2 removal from the atmosphere by direct air capture (DAC) is needed to achieve the internationally agreed global temperature goals. The most common CO2 capture technology is absorption by amine-based solvents in packed columns. Amino acid solutions have recently gained attention due to their advantages over traditional amine solvents. To be implemented effectively, DAC industrial processes need to handle large airflow rates in separation absorbers. The large air and solvent flow rates preclude the use of countercurrent columns due to high-pressure drops and the occurrence of flooding. Crossflow air–liquid absorbers are used to handle large air and liquid volumes due to their lower-pressure drop. The objective of this work…
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Taxonomy
TopicsCarbon Dioxide Capture Technologies · Adsorption and Cooling Systems · Process Optimization and Integration