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

Conference · Wed Feb 01 04:00:00 EST 1995

OSTI ID:10118151

Ho, P C; Palmer, D A

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.

• Research Organization: Oak Ridge National Lab., TN (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 10118151
• Report Number(s): CONF-9409219--5; ON: DE95006748
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201
AQUEOUS SOLUTIONS
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES
ELECTRIC CONDUCTIVITY
ELECTROLYTES
MEDIUM PRESSURE
POTASSIUM HYDROXIDES
PRESSURE DEPENDENCE
SODIUM CHLORIDES
SODIUM HYDROXIDES
SUPERCRITICAL STATE
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K