Experimental comparison of regeneration methods for CO<sub>2</sub> concentration from air using amine-based adsorbent
Publiceringsår
2021
Upphovspersoner
Elfving, Jere; Kauppinen, Juho; Jegoroff, Mikko; Ruuskanen, Vesa; Järvinen, Lauri; Sainio, Tuomo
Abstrakt
Comparison of different regeneration options for direct air capture (DAC) has usually been limited to only consider pure CO<sub>2</sub> production, limiting the process options to e.g. temperature-vacuum swing adsorption (TVSA) or steam-stripping. In this work, detailed experimental comparison is conducted of temperature swing adsorption (TSA/TCSA) and TVSA for DAC. Particularly, TVSA is assessed with air or inert gas purge flow (TVCSA) and without purge flow. The working capacity, regeneration specific energy requirement (SER) and adsorbent regenerability of these processes was compared. For all other studied regeneration options except TVSA without purge flow, over 85% regeneration was obtained already at 60 °C. Isobaric TSA at 60 °C had the lowest regeneration SER of 4.2 MJ/kg<sub>CO2</sub>. Coupling TSA with mild vacuum improved desorption rate and increased working capacity from 0.47 to 0.51 mmol<sub>CO2</sub>/g<sub>sorbent</sub>, requiring 7.5 MJ/kg<sub>CO2</sub> for regeneration. Without purge flow, TVSA resulted in only 0.39 mmolCO2/gsorbent with the SER of 8.6 MJ/kg<sub>CO2</sub> at 100 °C. Due to lower allowable regeneration temperature of 60 °C, mild vacuum TVSA with air flow also had a lower cyclic capacity decrease rate of 0.26 %/cycle compared to 0.38 %/cycle with TVSA without purge flow at 100 °C. However, using 100 °C with air flow in the TVSA process lead to a significant capacity decrease of 0.6 %/cycle. Therefore, using either air or inert purge flow below 100 °C coupled with mild vacuum has benefits over the TVSA process with no inflow in terms of CO<sub>2</sub> productivity, specific energy requirement and adsorbent regenerability. For utilization purposes that require low-concentration CO<sub>2</sub>, TVSA with purge flow should thus be considered as a viable regeneration option for direct air capture along with isobaric TSA.
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Publikationstyp
Publikationsform
Artikel
Moderpublikationens typ
Tidning
Artikelstyp
En originalartikel
Målgrupp
VetenskapligKollegialt utvärderad
Kollegialt utvärderadUKM:s publikationstyp
A1 Originalartikel i en vetenskaplig tidskriftPublikationskanalens uppgifter
Journal
Volym
404
Artikelnummer
126337
ISSN
Publikationsforum
Publikationsforumsnivå
3
Öppen tillgång
Öppen tillgänglighet i förläggarens tjänst
Ja
Öppen tillgång till publikationskanalen
Delvis öppen publikationskanal
Licens för förläggarens version
CC BY
Parallellsparad
Nej
Publiceringsavgift för öppen tillgång €
1650
Betalningsår för den öppen tillgång publiceringsavgiften
2021
Övriga uppgifter
Vetenskapsområden
Kemi; Teknisk kemi, kemisk processteknik
Nyckelord
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Språk
engelska
Internationell sampublikation
Nej
Sampublikation med ett företag
Nej
DOI
10.1016/j.cej.2020.126337
Publikationen ingår i undervisnings- och kulturministeriets datainsamling
Ja