Abstract
Absorption rates of carbonyl sulfide and carbon dioxide into aqueous methyldiethanolamine solutions with and without heterocyclic amine additives were measured in a stirred cell apparatus. All of the heterocyclic amine additives catalyzed COS absorption more strongly than that for CO2. In instances in which absorption rates were improved by the additives, those with the lowest pKb's were the most effective, although steric factors also apparently influence reaction kinetics.
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