Abstract
In this paper, kinetics and mechanism of the reaction between CO 2 and piperazine (PZ) or n-methyl piperazine (NMP) in aqueous and alcoholic solutions were investigated using direct stopped-flow technique under a range of temperatures (278, 288 and 298 K). The results show that the reactions follow a single termolecular reaction mechanism and the reaction rate between CO 2 and aqueous PZ (2669(278K), 11335(288K), 18042(298K) m3/kmol⋅s) is significantly higher than that of commonly employed amines, such as monoethanolamine (MEA). Our results strongly suggest that PZ and PZ derivatives can be used as promoters for CO 2 capture by sterically hindered amine solutions.
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