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Processes 2019, 7(2), 81; https://doi.org/10.3390/pr7020081

Reaction Kinetics of Carbon Dioxide in Aqueous Blends of N-Methyldiethanolamine and L-Arginine Using the Stopped-Flow Technique

1
Gas Processing Centre, College of Engineering, Qatar University, Doha 2713, Qatar
2
Clean Energy Technology Research Institute (CETRI), Faculty of Engineering, University of Regina, 3737 Wascana Parkway, Regina, SK S4S 0A2, Canada
*
Author to whom correspondence should be addressed.
Received: 7 January 2019 / Revised: 28 January 2019 / Accepted: 29 January 2019 / Published: 6 February 2019
(This article belongs to the Special Issue Gas Capture Processes)
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Abstract

Reduction of carbon dioxide emission from natural and industrial flue gases is paramount to help mitigate its effect on global warming. Efforts are continuously deployed worldwide to develop efficient technologies for CO2 capture. The use of environment friendly amino acids as rate promoters in the present amine systems has attracted the attention of many researchers recently. In this work, the reaction kinetics of carbon dioxide with blends of N-methyldiethanolamine and L-Arginine was investigated using stopped flow technique. The experiments were performed over a temperature range of 293 to 313 K and solution concentration up to one molar of different amino acid/amine ratios. The overall reaction rate constant (kov) was found to increase with increasing temperature and amine concentration as well as with increased proportion of L-Arginine concentration in the mixture. The experimental data were fitted to the zwitterion and termolecular mechanisms using a nonlinear regression technique with an average absolute deviation (AAD) of 7.6% and 8.0%, respectively. A comparative study of the promoting effect of L-Arginine with that of the effect of Glycine and DEA in MDEA blends showed that MDEA-Arginine blend exhibits faster reaction rate with CO2 with respect to MDEA-DEA blend, while the case was converse when compared to the MDEA-Glycine blend. View Full-Text
Keywords: Reaction; kinetics; carbon dioxide; N-methyldiethanolamine; L-Arginine; stopped flow technique Reaction; kinetics; carbon dioxide; N-methyldiethanolamine; L-Arginine; stopped flow technique
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Mahmud, N.; Benamor, A.; Nasser, M.; El-Naas, M.H.; Tontiwachwuthikul, P. Reaction Kinetics of Carbon Dioxide in Aqueous Blends of N-Methyldiethanolamine and L-Arginine Using the Stopped-Flow Technique. Processes 2019, 7, 81.

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