Degradation kinetics of monoethanolamine during CO2 and H2S absorption from biogas
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Author list: Kasikamphaiboon P., Chungsiriporn J., Bunyakan C., Wiyaratn W.
Publisher: Prince of Songkla University
Publication year: 2015
Journal: Songklanakarin Journal of Science and Technology (SJST) (0125-3395)
Volume number: 37
Issue number: 1
Start page: 65
End page: 72
Number of pages: 8
ISSN: 0125-3395
Languages: English-Great Britain (EN-GB)
Abstract
The rate of degradation of MEA during CO2 and H2S absorption in the biogas upgrading process was examined in four degradation systems, i.e., MEA-CO2, MEA-CO2-O2, MEA-CO2-H2S and MEA-CO2-O2-H2S. Degradation experiments were performed in a 800-ml stainless steel autoclave reactor, using MEA concentrations of 3 and 5 mol/L, CO2 loadings of 0.4 and 0.5 mol CO2/mol MEA, O2 pressure of 200 kPa, and H2S concentrations of 84 and 87 mg/L at temperatures of 120 and 140C. The results showed that, for the MEA-CO2 system, an increase in temperature or MEA concentration resulted in a higher rate of MEA degradation. In contrast, an increase in CO2 loading in the MEA-CO2-O2 system led to a reduction of MEA degradation. The degradation rate of the system with O2 was with 8.3 times as high as that of the system without O2. The presence of H2S did not appear to affect the rate of degradation in the MEA-CO2-H2S system. However, for the system in which both H2S and O2 were present, the MEA degradation was additionally induced by H2S, thus, resulting in higher degradation rates than those of the system with O2 only. The extent of degradation under the same period of time increased in the order MEA-CO2, MEA-CO2-H2S < MEA-CO2-O2 < MEA-CO2-O2-H2S. © 2015, Prince of Songkla University. All rights reserved.
Keywords
Absorption, Degradation, Monoethanolamine
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