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Title: Electrical conductivity measurements of aqueous electrolyte solutions at high temperatures and high pressures

Electrical conductivity measurements of aqueous electrolyte solutions at high temperatures and high pressures In aqueous solutions all electrolytes tend to associate at high temperatures (low dielectric constants). Ion association results in the formation of uncharged substrates, which are substantially more volatile than their precursor ions. Thus knowledge of the association constants is important in interpreting the thermodynamics of the partitioning of electrolytes to the vapor phase in a fully speciated approach. Electrical conductance measurements provide a unique window into ionic interactions of solutions at high temperatures and pressures. In this study, the electrical conductivities of dilute (<0.1 molal) aqueous solutions of NaCl (100-600{degrees}C to 300 MPa) and sodium and potassium hydroxides (0-600 and 100-600{degrees}C, respectively, and to 300 MPa) were measured. The results show that the extent of association of Na{sup +} and Cl{sup -} is similar to those for Na{sup +} and K{sup +} with OH{sup -} in solution from subcritical to supercritical conditions.
Authors: ;
Publication Date:
OSTI Identifier:OSTI ID: 10118151
Report Number(s):CONF-9409219--5
ON: DE95006748; TRN: 95:002062
DOE Contract Number:AC05-84OR21400
Resource Type:Conference
Resource Relation:Conference: 12. International conference on properties of water and steam,Orlando, FL (United States),11-16 Sep 1994; Other Information: PBD: [1995]
Research Org:Oak Ridge National Lab., TN (United States)
Sponsoring Org:USDOE, Washington, DC (United States)
Country of Publication:United States
Language:English
Subject: 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AQUEOUS SOLUTIONS; ELECTRIC CONDUCTIVITY; ELECTROLYTES; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; SODIUM CHLORIDES; SODIUM HYDROXIDES; POTASSIUM HYDROXIDES; SUPERCRITICAL STATE; PRESSURE DEPENDENCE; MEDIUM PRESSURE 400201; CHEMICAL AND PHYSICOCHEMICAL PROPERTIES