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The protonation constants (pKa) at infinite dilution and absorption properties of several non-alkanolamines were studied and their properties compared with that of common alkanolamines. The pKa of five amines were determined from 25 to 80°C. The promotor properties of the non-alkanolamines were studied in a mixed amine system with DEEA. The absorption capacity and cyclic capacities of both the single...