Experimental comparison of regeneration methods for CO2 concentration from air using amine-based adsorbent

• Only 60 °C coupled with purge gas regenerates amine-based adsorbent by over 85%. Coupling TVSA is beneficial in terms of CO 2 productivity. can have lower specific energy requirement than closed TVSA. Using air and 100 during regeneration significantly decreases capacity. Mild temperature a viable direct capture process option. Comparison different options for (DAC) has usually been limited to only consider pure production, limiting the e.g. temperature-vacuum swing adsorption (TVSA) or steam-stripping. In this work, detailed experimental comparison conducted (TSA/TCSA) DAC. Particularly, assessed inert flow (TVCSA) without flow. The working capacity, (SER) regenerability these processes was compared. For all other studied except flow, 85% obtained already at °C. Isobaric TSA had lowest SER 4.2 MJ/kg CO2 . mild vacuum improved desorption rate increased capacity from 0.47 0.51 mmol /g sorbent , requiring 7.5 regeneration. Without resulted 0.39 8.6 Due allowable °C, also cyclic decrease 0.26%/cycle compared 0.38%/cycle However, using lead significant 0.6%/cycle. Therefore, either below benefits no inflow productivity, regenerability. utilization purposes that require low-concentration should thus be considered as option along isobaric TSA.