Inderscience Publishers

The kinetics of carbon dioxide capture by solutions of piperazine and N-methyl piperazine

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In this paper, kinetics and mechanism of the reaction between CO2 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.

Keywords: alkanolamines, carbon dioxide, carbon capture, CO2, fast reaction kinetics, global warming, piperazine, stopped-flow technique

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