Vannak et al. (2023): Air-Purge Regenerative Direct Air Capture Using an Externally Heated and Cooled Temperature-Swing Adsorber Packed with Solid Amine

Heak Vannak, Yugo Osaka, Takuya Tsujiguchi, Akio Kodama IN: Separations, 10(7), https://doi.org/10.3390/separations10070415

Based on conventional or newly developed high-enriching processes, we investigated the rough enrichment of CO₂ from air via an externally heated or cooled adsorber (temperature-swing adsorption, TSA), along with air purge using double-pipe heat exchangers packed with low-volatility polyamine-loaded silica. A simple adsorption–desorption cycle was attempted in a TSA experiment, by varying the temperature from 20 °C to 60 °C using moist air, yielding an average CO₂ concentration of product gas that was ~17 times higher than the feed air, but the CO₂ recovery rate was poor. A double-step adsorption process was applied to increase CO₂ adsorption and recovery simultaneously.

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