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On the role of solid particles in CO 2 bubble nucleation for solvent regeneration of MEA‐based CO 2 capture technology
Author(s) -
Liu Menglong,
Tang Siyang,
Ma Kui,
Liu Changjun,
Yue Hairong,
Liang Bin
Publication year - 2019
Publication title -
greenhouse gases: science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.45
H-Index - 32
ISSN - 2152-3878
DOI - 10.1002/ghg.1866
Subject(s) - nucleation , desorption , mass transfer , chemical engineering , reaction rate , bubble , solvent , chemistry , autocatalysis , carbon fibers , materials science , analytical chemistry (journal) , adsorption , chromatography , organic chemistry , catalysis , composite material , mechanics , engineering , physics , composite number
Monoethanolamine (MEA) solution has been used widely in the post‐combustion CO 2 capture process; however, the high heat duty and reaction temperature (e.g. 125°C) for MEA regeneration leads to a high energy requirement (nearly 70–80% of the total running cost). We report the use of solid particles (H‐Zeolite Socony Mobile‐5 (HZSM‐5), quartz, and activated carbon) to facilitate the mass transfer of CO 2 bubble nucleation and enhance the CO 2 desorption rate. The results show that the mass transfer of CO 2 from liquid phase to gas phase is the rate‐determining step, rather than the chemical reaction. The addition of HZSM‐5 particles in the solution significantly enhanced CO 2 bubble nucleation by providing nucleation sites and gas cavities, leading to an average CO 2 desorption rate enhancement of 43.2%, and an energy consumption reduction of 23.3%. This process also operated at ∼95°C, which is a much lower temperature than that used in the commercial process and is feasible for industrial applications. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.