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Kinetic study of CO 2 absorption in aqueous solutions of 2‐((2‐aminoethyl)amino)‐ethanol using a stirred cell reaction calorimeter
Author(s) -
Mukherjee Satyajit,
Samanta Amar N.
Publication year - 2019
Publication title -
international journal of chemical kinetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.341
H-Index - 68
eISSN - 1097-4601
pISSN - 0538-8066
DOI - 10.1002/kin.21322
Subject(s) - chemistry , zwitterion , reaction calorimeter , reaction rate constant , aqueous solution , calorimeter (particle physics) , thermodynamics , solubility , reaction rate , solvent , viscosity , reaction mechanism , chemical kinetics , kinetics , calorimetry , organic chemistry , catalysis , molecule , detector , electrical engineering , engineering , physics , quantum mechanics
In the literature, aqueous 2‐((2‐aminoethyl)amino) ethanol (AEEA) is identified as a promising solvent for postcombustion CO 2 capture. In this work, the kinetics of CO 2 absorption in the aqueous AEEA, containing a primary and a secondary amino group, is studied over a wide temperature range of 303.15‐343.15 K and the amine concentration in the range of 0.47‐2.89 M using the fall‐in‐pressure technique in a stirred cell reaction calorimeter setup with a horizontal gas‐liquid interface. The overall rate constants for (AEEA + H 2 O + CO 2 ) reaction system are estimated in the pseudo–first‐order reaction regime. The kinetic models based on zwitterion and the termolecular reaction mechanisms are used to predict kinetic rate constants. The experimental kinetic data are better correlated using the zwitterion mechanism (AAD 9.18%) than that of the termolecular mechanism (AAD 10.4%). The density, viscosity, and physical solubility of pure components and aqueous binary mixtures of AEEA are also measured at the similar temperature and concentration ranges of rate kinetics. Empirical models are proposed to predict pure component density and viscosity data with AAD of 0.02% and 7.17%, respectively. The Redlich‐Kister model, the Grunberg‐Nissan model, and the O'Connell's model are used to correlate experimental density, viscosity, and physical solubility data of the binary mixtures with AAD of 0.034%, 4.92%, and 6.5%, respectively. The reaction activation energy ( E a ∼ 32 kJ/mol) of the (AEEA + H 2 O + CO 2 ) system is calculated from the Arrhenius power‐law model using the zwitterion mechanism, which indicates lower energy barrier than that of the reported value for monoethanolamine (∼44 kJ/mol) in the literature.