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A new model for correlation and prediction of equilibrium CO 2 solubility in N‐methyl‐4‐piperidinol solvent
Author(s) -
Xiao Min,
Cui Ding,
Liu Helei,
Tontiwachwuthikul Paitoon,
Liang Zhiwu
Publication year - 2017
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.15709
Subject(s) - solubility , aqueous solution , chemistry , thermodynamics , amine gas treating , solvent , equilibrium constant , dissociation (chemistry) , solubility equilibrium , organic chemistry , physics
In this work, the equilibrium CO 2 solubility in the aqueous tertiary amine, N‐methyl‐4‐piperidinol (MPDL) was measured over a range of temperatures, CO 2 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 CO 2 solubility in the MPDL‐H 2 O‐CO 2 system. This model, equipped with the correction factor (C f ), 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 (k 2 ) of MPDL and the heat of CO 2 absorption (–ΔH abs ) into aqueous MPDL solutions were evaluated as well. Based on the comparison with some conventional amines, MPDL revealed a high‐equilibrium CO 2 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 CO 2 capture. © 2017 American Institute of Chemical Engineers AIChE J , 63: 3395–3403, 2017