Consideration of some dilute-solution phenomena based on an expression for the gibbs free energy/sup 1/
Conference
·
· Int. J. Thermophys.; (United States)
OSTI ID:6909773
Rigorous expressions based on the Lennard-Jones (6-12) potential, are presented for the Gibbs and Helmholtz free energy of a dilute mixture. These expressions give the free energy of the mixture in terms of the thermodynamic properties of the pure solvent, thereby providing a convenient means of correlating dilute mixture behavior with that of the pure solvent. Expressions for the following dilute binary solution properties are derived: Henry's constant, limiting activity coefficients with their derivatives, solid solubilities in supercritical gases, and mixed second virial coefficients. The Henry's constant expression suggests a linear temperature dependence; application to solubility data for various gases in methane and water shows a good agreement between theory and experiment. In the thermodynamic modeling of supercritical fluid extraction, we have demonstrated how to predict new solubility-pressure isotherms from a given isotherm, with encouraging results. The mixed second virial coefficient expression has also been applied to experimental data; the agreement with theory is good.
- Research Organization:
- National Bureau of Standards, Gaithersburg, MD
- OSTI ID:
- 6909773
- Report Number(s):
- CONF-850617-
- Conference Information:
- Journal Name: Int. J. Thermophys.; (United States) Journal Volume: 7:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKANES
ARGON
BINARY MIXTURES
DATA
DILUTION
DISPERSIONS
ELEMENTS
ENERGY
EQUATIONS
EXTRACTION
FLUIDS
FREE ENERGY
FREE ENTHALPY
GASES
HELIUM
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
LENNARD-JONES POTENTIAL
MATHEMATICAL MODELS
METHANE
MIXTURES
NITROGEN
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POTENTIALS
RARE GASES
SEPARATION PROCESSES
SOLUBILITY
SOLUTIONS
SOLVENT EXTRACTION
SOLVENTS
SUPERCRITICAL GAS EXTRACTION
THEORETICAL DATA
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
VIRIAL EQUATION
WATER
360603* -- Materials-- Properties
ALKANES
ARGON
BINARY MIXTURES
DATA
DILUTION
DISPERSIONS
ELEMENTS
ENERGY
EQUATIONS
EXTRACTION
FLUIDS
FREE ENERGY
FREE ENTHALPY
GASES
HELIUM
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
LENNARD-JONES POTENTIAL
MATHEMATICAL MODELS
METHANE
MIXTURES
NITROGEN
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POTENTIALS
RARE GASES
SEPARATION PROCESSES
SOLUBILITY
SOLUTIONS
SOLVENT EXTRACTION
SOLVENTS
SUPERCRITICAL GAS EXTRACTION
THEORETICAL DATA
THERMODYNAMIC PROPERTIES
THERMODYNAMICS
VIRIAL EQUATION
WATER