The kinetics of reactions of carbon dioxide with monoethanolamine, diethanolamine and triethanolamine by a rapid mixing method

On the kinetics between CO2 and alkanolamines both in aqueous and non-aqueous solutions—I. Primary and secondary amines

“…However, the deviation of the results of a few studies (Hikita et al, 1977a;Barth et al, 1984) still remains unsatisfactorily. In order to evaluate the zwitterion-mechanism in more detail, additional experiments have been carried out in this study over a wider range of conditions and solvents.…”

“…Barth et al (1984) re-examined his results and concluded that the Blauwhoff approach was the closest to his results with respect to both reaction order and reaction rate constant. In spite of this good agreement a discrepancy still remains between the Blauwhoff approach and the results of Hikita et al (1977a).…”

“…For the two secondary amines DEA and DIPA the issue of the reaction order is still under discussion. Several authors reported overall second order kinetics (Sada et al, 1967;Barth et al, 1983;Blanc and Demarais, 1984;Savage and Kim, 1985), or overall third order kinetics (van Krevelen and Hoftijzer, 1948;Nunge and Gill, 1963;Hikita et al, 1977a;Alvarez-Fuster et al, 1980). Blauwhoff et al, (1984)and Laddhaand Danckwerts (198l)reportedan overall reaction order varying between two and three with the amine concentration.…”

Computational Comparison of the Reactions of Substituted Amines with CO2

“…MEA is a strong base and reacts rapidly and reversibly with CO 2 . [6][7][8][9][10][11][12] While the exact reaction mechanism is still a subject of debate, the overall reaction stoichiometry is generally accepted to be two amines per one CO 2 molecule. [13,5] Much work has been done to study the mechanism of the reaction of amines with CO 2 and its coupling to the CO 2 -water equilibria, [4,14,15] the prediction of pKa values of amines, [16] and the stability of carbamates from amines.…”

“…The advantage of nonaqueous systems is to escape the large effects of aqueous equilibria. [10] Technologies include supported liquid membranes of aqueous amine solutions, [19,20] amine-functionalized silica, [21,22] and amine enriched solid sorbents. [23] A hybrid Substituted amines are a popular choice as molecules to selectively react with and separate CO 2 from gas mixtures.…”