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Kinetics of COS with primary and secondary amines in aqueous solutions
Author(s) -
Littel R. J.,
Versteeg G. F.,
van Swaaij W. P. M.
Publication year - 1992
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690380210
Subject(s) - zwitterion , deprotonation , chemistry , amine gas treating , aqueous solution , primary (astronomy) , kinetics , kinetic energy , elementary reaction , reaction mechanism , reaction rate , inorganic chemistry , organic chemistry , polymer chemistry , catalysis , molecule , ion , physics , quantum mechanics , astronomy
The reaction between COS and aqueous solutions of primary and secondary amines has been studied by means of the stirred cell technique. Kinetic experiments at temperatures 283 to 333 K were carried out with MEA, DGA, DEA, DIPA, MMEA, AMP, and MOR. All kinetic experiments could be described by a zwitterion reaction mechanism similar to the mechanism proposed by Caplow (1968) for the reaction between CO 2 and secondary amines:\documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{l} COS + R_2 NH \leftrightarrow R_2 NH^ + COS^ - \\ R_2 NH^ + COS^ - + B \leftrightarrow R_2 NCOS^ - + BH^ + \\ \end{array} $$\end{document}Analysis of concentrated amine solutions at high COS concentrations by various analytical techniques confirmed the conclusions from the kinetic experiments. For all amines except for MEA, the overall reaction rate was found to be determined entirely by the zwitterion deprotonation rate.