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Title: | A new look to the old solvent: Mass transfer performance and mechanism of CO2 absorption into pure monoethanolamine in a spray column | Authors: | KAYAHAN , Emine Di Caprio, U van den Bogaert, A Khan, MN Bulut, M BRAEKEN, Leen Van Gerven, T Leblebici, ME |
Issue Date: | 2023 | Publisher: | ELSEVIER SCIENCE SA | Source: | Chemical engineering and processing (Print) = Verfahrenstechnik, 184 (Art N° 109285) | Abstract: | The most mature CO 2 capture technology is absorption of monoethanolamine (MEA) in packed or spray columns. Typically, an aqueous 30 wt.% MEA solution is used. High MEA concentrations are believed to hinder mass transfer rate due to high viscosity of MEA. We worked, for the first time, on the effects of using pure MEA on overall mass transfer coefficient (K G ɑ) and absorption efficiency in a spray column by varying several operational parameters. Image analysis results suggested that interfacial area increased with increasing liquid flow rate. As a result, K G ɑ increased. As opposed the belief in literature, K G ɑ also increased with increasing MEA concentrations. The highest K G ɑ was obtained in this work (11.7 kmol⋅m 3 •kPa 1 •h 1) is around one order of magnitude higher than most literature studies. Having more MEA molecules on the surface of the droplets led to higher K G ɑ. In addition, it was shown that absorption efficiency was largely determined by inlet CO 2 to MEA molar ratio. 13 C NMR spectra results revealed that similar levels of carbamate were formed for MEA concentrations up to 70 wt. %. A simplified analysis on regeneration heat duty showed that decreasing water amount can lead to 3-10 fold decrease in reboiler energy duty. | Keywords: | CO2 capture;Ethanolamine;Ultrasonic nozzle;Mass transfer;Absorption efficiency | Document URI: | http://hdl.handle.net/1942/43209 | ISSN: | 0255-2701 | e-ISSN: | 1873-3204 | DOI: | 10.1016/j.cep.2023.109285 | ISI #: | 000973007100001 | Rights: | 2023 Elsevier B.V. All rights reserved | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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A new look to the old solvent_ Mass transfer performance and mechanism .pdf Restricted Access | Published version | 4.94 MB | Adobe PDF | View/Open Request a copy |
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