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- W2969879423 abstract "Carbon dioxide (CO2) concentration in the atmosphere surpassed the 400 ppm milestone in 2016 [1], approximately 120 ppm higher compared to the pre-industrial era. Along with the significant increase in the CO2 level during the past decades, the human race has witnessed unprecedented climate change [2]. Therefore, it is necessary to find an efficient solution for capturing CO2 from flue gases, in order to cut down anthropogenic CO2 emissions. There is an increasing interest in polyamines, because they possess multiple reactive sites for high CO2 uptake capacity, high thermal stability, as well as lower toxicity compared to the today's alternatives. Polyamines have the potential to improve the CO2 loading, CO2 absorption rate, and has a lower energy penalty [3, 4]. A reversible CO2 uptake study was performed in neat pentaethylenehexamine (PEHA) and its aqueous solutions, and the performance was compared with industrially applied aqueous solution of monoethanolamine (MEA). Simultaneously, the relative amount of CO2 chemisorbed chemical species, such as carbamates/(bi)-carbonates forming, was studied using NMR analysis and a calculation method introduced by Holmes et al. [5]. Furthermore, the CO2 capture capacity of the solvents, correlated with their respective Kamlet-Taft polarity parameters, and the system were modelled with Linear Solvation Energy Relationship (LSER) approach. It was observed that CO2 capture capacity, as well as the nature of chemical species were influenced by water. The LSER calculations represented that amongst the studied Kamlet-Taft parameters, the CO2 capture capacity merely depends on hydrogen bond acceptor ability (beta) and polarizability (pi). Upon the thermal regeneration study, the pure PEHA was obtained from CO2 saturated reaction mixture at 120°C. Considering the high CO2 absorption capacity and very low evaporation rate during regeneration compared to aqueous solution of MEA, PEHA can be used as a sustainable solvent for CO2 capture in large-scale flue gas cleaning processes." @default.
- W2969879423 created "2019-08-29" @default.
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- W2969879423 date "2018-04-16" @default.
- W2969879423 modified "2023-09-23" @default.
- W2969879423 title "Switchable Aqueous Pentaethylenehexamine for CO 2 Capture" @default.
- W2969879423 hasPublicationYear "2018" @default.
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