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Coupled CO2 absorption and phase separation with precise phase regulation on biphasic absorbent
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DOI：10.1002/aic.70509.png)
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Abstract
En 中文
Liquid–liquid phase separation is an interesting phenomenon that generates two immiscible liquid phases during CO2 absorption or temperature swing. It provides a promising opportunity to optimize CO2 capture processes and reduce the energy penalty for solvent regeneration. However, precise control of phase behavior remains challenging. This work achieves controllable phase separation in amine-ether-water systems. Results show that adjusting the ether-to-water mass ratio enables the correlation between critical CO2 loading and temperature to reversibly shift from negative to positive. This rule is verified in various amines and ethers. Synergistic effects of temperature and CO2 absorption on phase separation are revealed by 13C NMR and molecular dynamics simulations. This study deepens the understanding of phase separation and offers a theoretical basis for developing high-performance CO2 absorbents for industrial applications.
Keywords:
biphasic absorbent
CO2 capture
ether-to-water mass ratio
phase behavior regulation
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1.1W
Citations:
2.9W
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