Show simple item record

dc.contributor.authorEvjen, Sigvart
dc.contributor.authorFiksdahl, Anne
dc.contributor.authorPinto, Diego Di Domenico
dc.contributor.authorKnuutila, Hanna K
dc.identifier.citationInternational Journal of Greenhouse Gas Control. 2018, 76 167-174.nb_NO
dc.description.abstractAqueous polyalkylated imidazoles have gained interest as potential CO2 capture solvents due to their high oxidative stability and low vapor pressures compared to traditional amines. In this work, 21 aqueous solutions of polyalkylatedimidazoles were screened as absorbents for CO2 capture and four solvent candidates were further characterized by measuring the vapor-liquid equilibria and the heat of absorption of CO2. The pKa values of the imidazoles were measured and a positive correlation between the absorption capacity and pKa of polyalkylated imidazoles was found. Increasing the pKa of imidazoles to 9 by alkylation improved the CO2 absorption capacity significantly. Based on the equilibrium experiments, the cyclic capacities of the selected solvents varied from 0.8 to 2 mol CO2/kg solvent. Furthermore, the heat of absorption of CO2 of the studied imidazoles was lower compared to primary amines. In general, the tested polyalkylated imidazoles are more feasible for processes with partial pressures of CO2 above 50 kPa. Trimethylimidazole that forms bicarbonate precipitate might be applicable for post combustion CO2 capture as a high cyclic capacity is obtained even at CO2 partial pressures around 10 kPa. The present study gives new important knowledge of the absorption properties of polyalkylated imidazoles.nb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.titleNew Polyalkylated Imidazoles Tailored for Carbon Dioxide Capturenb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.journalInternational Journal of Greenhouse Gas Controlnb_NO
dc.relation.projectNorges forskningsråd: 233776nb_NO
dc.description.localcode© 2018. This is the authors’ accepted and refereed manuscript to the article. Locked until 14.7.2020 due to copyright restrictions. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
cristin.unitnameInstitutt for kjemi
cristin.unitnameInstitutt for kjemisk prosessteknologi

Files in this item


This item appears in the following Collection(s)

Show simple item record

Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal