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A Study on CO 2 Absorption Kinetics by Aqueous Solutions of N , N ‐Diethylethanolamine and N ‐Ethylethanolamine
Author(s) -
Vaidya P. D.,
Kenig E. Y.
Publication year - 2009
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.200800573
Subject(s) - chemistry , zwitterion , reaction rate constant , aqueous solution , kinetics , absorption (acoustics) , chemical kinetics , analytical chemistry (journal) , reaction rate , reaction mechanism , mass transfer , catalysis , chromatography , organic chemistry , molecule , materials science , physics , quantum mechanics , composite material
N ‐Ethylethanolamine (EEA) and N , N ‐diethylethanolamine (DEEA) represent promising candidate alkanolamines for CO 2 removal from gaseous streams, as they can be prepared from renewable resources. In this work, the reaction rate constant for the reaction between CO 2 and EEA was determined from the absorption rate measurements of CO 2 in a blend comprising DEEA, EEA and H 2 O. A stirred‐cell reactor with a plane, horizontal gas‐liquid interface was used for the absorption studies. While the DEEA concentration in the formulated solution was varied in the range of 1.5–2.5 kmol/m 3 , the initial EEA concentration was 0.1 kmol/m 3 . A zwitterion mechanism for EEA and a base‐catalyzed hydration mechanism for DEEA were used to describe the reaction kinetics. At 303 K, the second‐order reaction rate constant for the CO 2 reaction with EEA was found to be 8041 m 3 /(kmol s). The liquid‐side mass transfer coefficient was also estimated, and its value (0.004 cm/s) is in line with those typical of stirred‐cell reactors.