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Gas solubility and Henry's law near the solvent's critical point
Author(s) -
Japas M. L.,
Sengers J. M. H. Levelt
Publication year - 1989
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.690350502
Subject(s) - thermodynamics , solubility , critical point (mathematics) , solvent , henry's law , constant (computer programming) , chemistry , limiting , triple point , atmospheric temperature range , benzene , range (aeronautics) , materials science , physics , organic chemistry , mathematics , mechanical engineering , mathematical analysis , computer science , engineering , composite material , programming language
It has been experimentally observed, for water and nonaqueous solvents alike, that Henry's constant passes through a maximum and then declines as the temperature is raised from the triple point to the critical point. From classical and nonclassical models, we derive exact relations for the value of Henry's constant and its temperature dependence at the solvent's critical point, showing that the decline of this constant is a universal phenomenon. We demonstrate that the limiting temperature dependence of Henry's constant can be predicted from the thermodynamic properties of the pure solvent and the initial slope of the critical line. The validity of our prediction is tested by comparing it with experimental solubility data for several gases in high‐temperature water and benzene. Our predictive model appears valid over a temperature range of at least 15% in temperature below the critical point of the solvent.