Equations of state for solid NaCl-KCl and liquid NaCl-KCl-H sub 2 O
The equilibrium between the solid solution of NaCl-KCl and the ternary liquid NaCl-KCl-H{sub 2}O is both scientifically interesting and geologically important. Equations of the Margules type have been derived for the two phases that accurately reproduce the extensive array of published measurements, together with recent measurements for the liquids of the ternary and the solution of the NaCl-KCl binary. The range of validity of the equations extends to 1200 K, to 5 kbar, but for aqueous systems it is limited to compositions on the salt saturation surface. Of particular interest is the transition in the liquid-solid equilibrium of the ternary from the pattern at high temperatures where the solid is a solution of composition near that of the liquid to that at lower temperatures where the solid is nearly pure NaCl or KCl. The phase compositions for anhydrous NaCl-KCl are consistent with published heat of mixing data and yield a new expression for the entropy of mixing. 17 refs., 2 figs.
- Research Organization:
- Lawrence Berkeley Lab., CA (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5410597
- Report Number(s):
- LBL-30916; CONF-9106176-5; ON: DE91016980
- Resource Relation:
- Conference: 11. symposium on thermophysical properties, Boulder, CO (United States), 23-27 Jun 1991
- Country of Publication:
- United States
- Language:
- English
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Phase relations in the system NaCl-KCl-H sub 2 O: IV. Differential thermal analysis of the sylvite liquidus in the KCl-H sub 2 O binary, the liquidus in the NaCl-KCl-H sub 2 O ternary, and the solidus in the NaCl-KCl binary to 2 kb pressure, and a summary of experimental data for thermodynamic-PTX analysis of solid-liquid equilibria at elevated P-T conditions
Phase equilibria and volumetric properties of the systems KCl-H[sub 2]O and NaCl-KCl-H[sub 2]O above 573 K: Equation of state representation
Related Subjects
LIQUIDS
EQUATIONS OF STATE
POTASSIUM CHLORIDES
PHASE TRANSFORMATIONS
SODIUM CHLORIDES
SOLID SOLUTIONS
FREE ENTHALPY
MATHEMATICAL MODELS
ALKALI METAL COMPOUNDS
CHLORIDES
CHLORINE COMPOUNDS
DISPERSIONS
ENERGY
EQUATIONS
FLUIDS
HALIDES
HALOGEN COMPOUNDS
MIXTURES
PHYSICAL PROPERTIES
POTASSIUM COMPOUNDS
SODIUM COMPOUNDS
SOLUTIONS
THERMODYNAMIC PROPERTIES
360602* - Other Materials- Structure & Phase Studies
360603 - Materials- Properties