CaCl{sub 2}-H{sub 2}O in the supercritical and two-phase ranges

Journal Article · Wed Mar 01 04:00:00 EST 1995 · International Journal of Thermophysics

DOI:https://doi.org/10.1007/BF01441914· OSTI ID:75393

Oakes, C S; 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 Institute and State Univ., Blacksburg, VA (United States)
3. Oak Ridge National Lab., TN (United States)

Critical temperatures (T{sub c}) and densities ({rho}{sub c}) for aqueous CaCl{sub 2} solutions were measured using two different optical techniques. Measurements of T{sub 3} were made using sealed silica capillaries containing 0.3, 0.5, 1.0 and 2.0 molal CaCl{sub 2}(aq) solutions. The T{sub c} values 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 the second method for 1.0, 2.0, and 3.0 molal CaCl{sub 2}(aq) solutions are 680, 739, and 838 K, respectively. The T{sub c} for 4.0 molal CaCl{sub 2}(aq) was found to be in excess of 933 K. The capillary-tube measurements yield approximate values of the critical density {rho}{sub c}, but do not give the critical pressure P{sub c}. Approximate values of P{sub c} are available, however, from other sources.

• Sponsoring Organization: USDOE
• DOE Contract Number: FG05-89ER14065
• OSTI ID: 75393
• Report Number(s): CONF-940633--
• Journal Information: International Journal of Thermophysics, Journal Name: International Journal of Thermophysics Journal Issue: 2 Vol. 16; ISSN IJTHDY; ISSN 0195-928X
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
AQUEOUS SOLUTIONS
CALCIUM CHLORIDES
CRITICAL PRESSURE
CRITICAL TEMPERATURE
DENSITY