Excess thermodynamic properties of aqueous electrolytes to high temperatures and pressures

Conference · Thu Jan 01 00:00:00 EST 1987

OSTI ID:5896964

Simonson, J M; Holmes, H F; Mesmer, R E; Busey, R H

Excess thermodynamic properties have been obtained for a number of pure and mixed aqueous electrolyte solutions at high temperatures and pressures through measurements of isopiestic ratios and enthalpies of dilution. The equipment and techniques used in these studies are described. Representations of the experimental results used to correlate measured values and calculate other thermodynamic quantities from the experimental results are described. Isopiestic ratios relative to NaCl(aq) standard solutions have been measured for a number of classes of electrolytes to 250/sup 0/C, including the alkali and alkaline earth chlorides, alkali sulfates and bisulfates, and a number of mixed electrolyte solutions. Flow calorimetric measurements of dilution enthalpies have been made as functions of temperature and pressure to 400/sup 0/C and 400 bars on NaCl(aq), CaCl/sub 2/(aq) and NaOH(aq). Results extend across the temperature range of transition between strong electrolyte behavior, as indicated by results at low temperatures, and ion association at high temperatures, as has been indicated in studies of electrical conductance. Modeling of the experimental results obtained in this program with other available data has given consistent sets of values of excess thermodynamic properties for a number of aqueous electrolyte systems. 47 refs., 8 figs., 2 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 5896964
• Report Number(s): CONF-870594-3; ON: DE88001768
• Resource Relation: Conference: International conference on thermodynamics of aqueous systems with industrial applications, Warrenton, VA, USA, 10 May 1987; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AQUEOUS SOLUTIONS
THERMODYNAMIC PROPERTIES
CHLORIDES
ELECTROLYTES
HYDROCHLORIC ACID
SODIUM HYDROXIDES
SULFATES
SULFURIC ACID
HIGH PRESSURE
HIGH TEMPERATURE
MEDIUM TEMPERATURE
PRESSURE DEPENDENCE
ALKALI METAL COMPOUNDS
CHLORINE COMPOUNDS
DISPERSIONS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
INORGANIC ACIDS
MIXTURES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SODIUM COMPOUNDS
SOLUTIONS
SULFUR COMPOUNDS
400201* - Chemical & Physicochemical Properties