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Vapour liquid equilibrium calculations for dilute aqueous solutions of CO 2 , H 2 S, NH 3 and NaOH to 300°C
Author(s) -
Roberts Bruce E.,
Tremaine Peter R.
Publication year - 1985
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450630215
Subject(s) - thermodynamics , aqueous solution , vapor pressure , enthalpy , chemistry , equation of state , heat capacity , vapor–liquid equilibrium , ionic bonding , henry's law , ion , organic chemistry , physics
Henry's law constants for aqueous CO 2 , H 2 S and NH 3 up to 300°C have been recalculated from literature vapour pressure, enthalpy and heat capacity data. The high vapour pressure of water above 150°C causes significant solute‐water interactions in the gas phase, which were calculated using the Peng‐Robinson cubic equation of state. The results were combined with selected ionization constant data to derive a vapour‐liquid equilibrium model for dilute solutions. The model reproduces experimental data for binary systems at solute molalities of up to 0.5 m at 100°C, 1.0 m above 250°C and ionic strengths below about 0.1 m.