CaCl₂-H₂O in the supercritical and two-phase ranges

Technical Report · Fri Apr 01 00:00:00 EST 1994

DOI:https://doi.org/10.2172/10157191· OSTI ID:10157191

Oakes, C. S. ^[1]; Pitzer, K. S. ^[1]; Bodnar, R. J. ^[2]; Simonson, J. M. ^[3]

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1. Lawrence Berkeley Lab., CA (United States)
2. Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Dept. of Geological Sciences
3. Oak Ridge National Lab., TN (United States)

Critical temperatures (T_c) and densities ρ_c for aqueous CaCl₂ solutions were measured using two different optical techniques. Measurements of T_c were made using sealed silica capillaries containing 0.3, 0.5, 1.0 and 2.0 molal CaCl₂(aq) solutions. T_c`s from these measurements are 661, 666, 678, and 738 K, respectively. Critical temperatures were also determined from measured homogenization temperatures and the observed mode of homogenization (i.e., to the liquid or vapor phase or by fading of the meniscus) in synthetic fluid inclusions. Critical temperatures determined by this method for 1.0, 2.0, and 3.0 molal CaCl₂(aq) solutions are 680, 739, and 838 K, respectively. T_c for 4.0 molal CaCl₂(aq) was found to be in excess of 933 K. Critical pressures (P_c}) could not be accurately determined from these measurements but were estimated from another source. Our data are in fair agreement with previously published data at and below 1.0 mol-∙kg^-1}. Above 1 mol∙kg^-1}, data from the two published sources of CaCl₂(aq) show substantially different trends, with the data from this study agreeing with the more recent of the two reports. Estimated values of ρ_c are given for the solutions examined in the capillary tube experiments. These measurements are based on estimated tube volumes, measured liquid volumes, and solution densities at ambient temperature.

• Research Organization: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC03-76SF00098; FG05-89ER14065
• OSTI ID: 10157191
• Report Number(s): LBL-35515; CONF-940633-3; ON: DE94013098; BR: KC0403020
• Resource Relation: Conference: 12. symposium on thermophysical properties, Boulder, CO (United States), 19-24 Jun 1994
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CALCIUM CHLORIDES
CRITICAL TEMPERATURE
SUPERCRITICAL STATE
AQUEOUS SOLUTIONS
DENSITY
EXPERIMENTAL DATA
IONIZATION
400201
CHEMICAL AND PHYSICOCHEMICAL PROPERTIES