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Title: Phase Behavior of Aqueous Na - K - Mg - Ca - Cl - NO 3 Mixtures: Isopiestic Measurements and Thermodynamic Modeling

Abstract

A comprehensive model has been established for calculating thermodynamic properties of multicomponent aqueous systems containing the Na{sup +}, K{sup +}, Mg{sup 2+}, Ca{sup 2+}, Cl{sup -} and NO{sub 3}{sup -} ions. The thermodynamic framework is based on a previously developed model for mixed-solvent electrolyte solutions. The framework has been designed to reproduce the properties of salt solutions at temperatures ranging from the freezing point to 300 C and concentrations ranging from infinite dilution to the fused salt limit. The model has been parameterized using a combination of an extensive literature database and new isopiestic measurements for thirteen salt mixtures at 140 C. The measurements have been performed using Oak Ridge National Laboratory's (ORNL) previously designed gravimetric isopiestic apparatus, which can also detect solid phase precipitation. In addition to various Na-K-Mg-Ca-Cl-NO{sub 3} systems, results are reported for LiCl solutions. Water activities are reported for mixtures with a fixed ratio of salts as a function of the total apparent salt mole fraction. The isopiestic measurements reported here simultaneously reflect two fundamental properties of the system, i.e., the activity of water as a function of solution concentration and the occurrence of solid-liquid transitions. The thermodynamic model accurately reproduces the new isopiestic data asmore » well as literature data for binary, ternary and higher-order subsystems. Because of its high accuracy in calculating vapor-liquid and solid-liquid equilibria, the model is suitable for studying deliquescence behavior of multicomponent salt systems.« less

Authors:
 [1];  [2];  [2];  [2]
  1. ORNL
  2. OLI Systems, Inc., Morris Plains, NJ
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
RW USDOE - Office of Civilian Radioactive Waste Management (RW)
OSTI Identifier:
1007807
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Journal of Solution Chemistry
Additional Journal Information:
Journal Volume: 36; Journal Issue: 6; Journal ID: ISSN 0095--9782
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ACCURACY; DILUTION; ELECTROLYTES; MELTING POINTS; MIXTURES; MOLTEN SALTS; ORNL; PRECIPITATION; SIMULATION; THERMODYNAMIC MODEL; THERMODYNAMIC PROPERTIES; THERMODYNAMICS; WATER

Citation Formats

Gruszkiewicz, Miroslaw, Palmer, Donald, Springer, Ronald D., Wang, Peiming, and Anderko, Andrzej. Phase Behavior of Aqueous Na - K - Mg - Ca - Cl - NO3 Mixtures: Isopiestic Measurements and Thermodynamic Modeling. United States: N. p., 2007. Web. doi:10.1007/s10953-007-9145-2.
Gruszkiewicz, Miroslaw, Palmer, Donald, Springer, Ronald D., Wang, Peiming, & Anderko, Andrzej. Phase Behavior of Aqueous Na - K - Mg - Ca - Cl - NO3 Mixtures: Isopiestic Measurements and Thermodynamic Modeling. United States. doi:10.1007/s10953-007-9145-2.
Gruszkiewicz, Miroslaw, Palmer, Donald, Springer, Ronald D., Wang, Peiming, and Anderko, Andrzej. Mon . "Phase Behavior of Aqueous Na - K - Mg - Ca - Cl - NO3 Mixtures: Isopiestic Measurements and Thermodynamic Modeling". United States. doi:10.1007/s10953-007-9145-2.
@article{osti_1007807,
title = {Phase Behavior of Aqueous Na - K - Mg - Ca - Cl - NO3 Mixtures: Isopiestic Measurements and Thermodynamic Modeling},
author = {Gruszkiewicz, Miroslaw and Palmer, Donald and Springer, Ronald D. and Wang, Peiming and Anderko, Andrzej},
abstractNote = {A comprehensive model has been established for calculating thermodynamic properties of multicomponent aqueous systems containing the Na{sup +}, K{sup +}, Mg{sup 2+}, Ca{sup 2+}, Cl{sup -} and NO{sub 3}{sup -} ions. The thermodynamic framework is based on a previously developed model for mixed-solvent electrolyte solutions. The framework has been designed to reproduce the properties of salt solutions at temperatures ranging from the freezing point to 300 C and concentrations ranging from infinite dilution to the fused salt limit. The model has been parameterized using a combination of an extensive literature database and new isopiestic measurements for thirteen salt mixtures at 140 C. The measurements have been performed using Oak Ridge National Laboratory's (ORNL) previously designed gravimetric isopiestic apparatus, which can also detect solid phase precipitation. In addition to various Na-K-Mg-Ca-Cl-NO{sub 3} systems, results are reported for LiCl solutions. Water activities are reported for mixtures with a fixed ratio of salts as a function of the total apparent salt mole fraction. The isopiestic measurements reported here simultaneously reflect two fundamental properties of the system, i.e., the activity of water as a function of solution concentration and the occurrence of solid-liquid transitions. The thermodynamic model accurately reproduces the new isopiestic data as well as literature data for binary, ternary and higher-order subsystems. Because of its high accuracy in calculating vapor-liquid and solid-liquid equilibria, the model is suitable for studying deliquescence behavior of multicomponent salt systems.},
doi = {10.1007/s10953-007-9145-2},
journal = {Journal of Solution Chemistry},
issn = {0095--9782},
number = 6,
volume = 36,
place = {United States},
year = {2007},
month = {1}
}