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- Title
A new model for correlation and prediction of equilibrium CO<sub>2</sub> solubility in N-methyl-4-piperidinol solvent.
- Authors
Xiao, Min; Cui, Ding; Liu, Helei; Tontiwachwuthikul, Paitoon; Liang, Zhiwu
- Abstract
In this work, the equilibrium CO2 solubility in the aqueous tertiary amine, N-methyl-4-piperidinol (MPDL) was measured over a range of temperatures, CO2 partial pressures and amine concentrations. The dissociation constant of the MPDL solution was determined as well. A new thermodynamic model was developed to predict the equilibrium CO2 solubility in the MPDL-H2O-CO2 system. This model, equipped with the correction factor (Cf), can give reasonable prediction with an average absolute deviation of 2.0%, and performs better than other models (i.e., KE model, Li-Shen model, and Hu-Chakma). The second-order reaction rate constant (k2) of MPDL and the heat of CO2 absorption (-ΔHabs) into aqueous MPDL solutions were evaluated as well. Based on the comparison with some conventional amines, MPDL revealed a high-equilibrium CO2 loading, reasonably fast absorption rate when compared with other tertiary amines, and a low energy requirement for regeneration. It may, therefore, be considered to be an alternative solvent for CO2 capture. © 2017 American Institute of Chemical Engineers AIChE J, 63: 3395-3403, 2017
- Subjects
CARBON sequestration; AMINES; THERMODYNAMICS; PIPERIDINE; ABSORPTION
- Publication
AIChE Journal, 2017, Vol 63, Issue 8, p3395
- ISSN
0001-1541
- Publication type
Article
- DOI
10.1002/aic.15709