skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Critical and superciritcal properties of 0.3 to 3.0 mol{center_dot}kg{sup {minus}1} CaCl{sub 2}(aq)

Abstract

Critical temperatures (T{sub c}) and densities (p{sub c}) for aqueous CaCl{sub 2} solutions were measured using two different optical techniques. Fluid inclusions with compositions of 0.5 to 4.0 mol{center_dot}ks{sup {minus}1} were synthesized from 600 to 820{degrees}C and at 1500 and 2500 bars in both the single and two-fluid phase fields. Critical temperatures were 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 between apparent equal volumes of liquid and vapor). Critical temperatures determined by this method for 0.5, 1.0, 2.0, and 3.0 molal CaCl{sub 2}(aq) solutions are 395, 406, 466, and 565{degrees}C, respectively. T{sub c} for 4.0 molal CaCl{sub 2}(aq) was found to be in excess of 662{degree}C. Critical pressures (P{sub c}) could not be accurately determined from these measurements but were estimated from another source. Measurements of T{sub c} were also made using sealed silica capillaries containing 0.3, 0.5, 1.0, and 2.0 molal Cal{sub 2}(aq) solutions. T{sub c} values from these measurements are 388, 393, 405, and 465{degrees}C, respectively. Our data are in fair agreement with previously published data at and below 1.0 mol{center_dot}kg{sup {minus}1}, data from the two published sources of CaCl{sub 2}(aq)more » T{sub 2} measurements show substantially different trends, with the data from this study agreeing with the more recent of the two reports. Estimated values of p{sub c} are given for the solutions examined in the capillary tube experiments. Critical isochores are presented with new synthetic fluid inclusion derived isochores for 1.0 and 2.0 mol{center_dot}kg{sup {minus}1} Cal{sub 2}(aq) liquids to form a complete arrays of isochores for temperatures form {approximately} 100{degrees}C to those along the critical isochore and pressures to 5000 bars. 18 refs., 6 figs., 5 tabs.« less

Authors:
; ;  [1];  [2]
  1. State Univ., Blacksburg, VA (United States)
  2. Oak Ridge National Lab., TN (United States)
Publication Date:
OSTI Identifier:
482168
DOE Contract Number:  
FG05-89ER14065; AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Geochimica et Cosmochimica Acta
Additional Journal Information:
Journal Volume: 58; Journal Issue: 11; Other Information: PBD: Jun 1994
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; CALCIUM CHLORIDES; CHEMICAL REACTION KINETICS; SUPERCRITICAL STATE; INCLUSIONS; SYNTHESIS; DATA COMPILATION

Citation Formats

Oakes, C S, Bodnar, R J, Pitzer, K S, Lawrence Berkeley Lab., CA, and Simonson, J M. Critical and superciritcal properties of 0.3 to 3.0 mol{center_dot}kg{sup {minus}1} CaCl{sub 2}(aq). United States: N. p., 1994. Web. doi:10.1016/0016-7037(94)90021-3.
Oakes, C S, Bodnar, R J, Pitzer, K S, Lawrence Berkeley Lab., CA, & Simonson, J M. Critical and superciritcal properties of 0.3 to 3.0 mol{center_dot}kg{sup {minus}1} CaCl{sub 2}(aq). United States. https://doi.org/10.1016/0016-7037(94)90021-3
Oakes, C S, Bodnar, R J, Pitzer, K S, Lawrence Berkeley Lab., CA, and Simonson, J M. Wed . "Critical and superciritcal properties of 0.3 to 3.0 mol{center_dot}kg{sup {minus}1} CaCl{sub 2}(aq)". United States. https://doi.org/10.1016/0016-7037(94)90021-3.
@article{osti_482168,
title = {Critical and superciritcal properties of 0.3 to 3.0 mol{center_dot}kg{sup {minus}1} CaCl{sub 2}(aq)},
author = {Oakes, C S and Bodnar, R J and Pitzer, K S and Lawrence Berkeley Lab., CA and Simonson, J M},
abstractNote = {Critical temperatures (T{sub c}) and densities (p{sub c}) for aqueous CaCl{sub 2} solutions were measured using two different optical techniques. Fluid inclusions with compositions of 0.5 to 4.0 mol{center_dot}ks{sup {minus}1} were synthesized from 600 to 820{degrees}C and at 1500 and 2500 bars in both the single and two-fluid phase fields. Critical temperatures were 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 between apparent equal volumes of liquid and vapor). Critical temperatures determined by this method for 0.5, 1.0, 2.0, and 3.0 molal CaCl{sub 2}(aq) solutions are 395, 406, 466, and 565{degrees}C, respectively. T{sub c} for 4.0 molal CaCl{sub 2}(aq) was found to be in excess of 662{degree}C. Critical pressures (P{sub c}) could not be accurately determined from these measurements but were estimated from another source. Measurements of T{sub c} were also made using sealed silica capillaries containing 0.3, 0.5, 1.0, and 2.0 molal Cal{sub 2}(aq) solutions. T{sub c} values from these measurements are 388, 393, 405, and 465{degrees}C, respectively. Our data are in fair agreement with previously published data at and below 1.0 mol{center_dot}kg{sup {minus}1}, data from the two published sources of CaCl{sub 2}(aq) T{sub 2} measurements show substantially different trends, with the data from this study agreeing with the more recent of the two reports. Estimated values of p{sub c} are given for the solutions examined in the capillary tube experiments. Critical isochores are presented with new synthetic fluid inclusion derived isochores for 1.0 and 2.0 mol{center_dot}kg{sup {minus}1} Cal{sub 2}(aq) liquids to form a complete arrays of isochores for temperatures form {approximately} 100{degrees}C to those along the critical isochore and pressures to 5000 bars. 18 refs., 6 figs., 5 tabs.},
doi = {10.1016/0016-7037(94)90021-3},
url = {https://www.osti.gov/biblio/482168}, journal = {Geochimica et Cosmochimica Acta},
number = 11,
volume = 58,
place = {United States},
year = {1994},
month = {6}
}