Phase Equilibria in Binary and Ternary Hydrothermal Systems

Valyashko, V. M.

doi:10.1002/9780470094679.ch1

Cited by 23 publications

(54 citation statements)

References 147 publications

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“…Previous studies confirmed that the solubilities of many alkali metal sulfates were significantly decreased in SCW and sulfates precipitated from supercritical solutions [2][3][4][5]. However, many aqueous sulfate solutions were reported to show intriguing liquid-liquid immiscibility at elevated temperatures [6][7]; the homogeneous aqueous solution separated into two immiscible liquid phases coexisting with vapor phase. It should be noted that no precipitate was formed in this case, even though the temperature reached the supercritical point of water.…”

Section: Introductionsupporting

confidence: 50%

Visual and in situ Raman spectroscopic observations of the liquid–liquid immiscibility in aqueous uranyl sulfate solutions at temperatures up to 420°C

Wang

Wan

et al. 2016

The Journal of Supercritical Fluids

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spectroscopic observations of the liquid-liquid immiscibility in aqueous uranyl sulfate solutions at temperatures up to 420 circ C, The Journal of Supercritical Fluids http://dx.doi.org/10. 1016/j.supflu.2016.03.005 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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Section: Introductionsupporting

confidence: 50%

Visual and in situ Raman spectroscopic observations of the liquid–liquid immiscibility in aqueous uranyl sulfate solutions at temperatures up to 420°C

Wang

Wan

et al. 2016

The Journal of Supercritical Fluids

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“…[4][5][6] Type 2 systems exhibit phase behavior in which the salt solubility decreases with increasing temperature (Figure 1) and reaches very low values in the proximity of the critical point of pure water (374 °C, 22.1 MPa). 7 Consequently, type 2 salts are likely to precipitate during hydrothermal processes, leading to scaling of the plant (or fouling, if a catalyst is involved in the process). Among the changes water undergoes at elevated temperatures and pressures, the most important effect for solution chemistry is the decrease in static permittivity (or dielectric constant).…”

Section: Introductionmentioning

confidence: 99%

Ion Association in Hydrothermal Sodium Sulfate Solutions Studied by Modulated FT-IR-Raman Spectroscopy and Molecular Dynamics

et al. 2015

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Saline aqueous solutions at elevated pressures and temperatures play an important role in processes such as supercritical water oxidation (SCWO) and supercritical water gasification (SCWG), as well as in natural geochemical processes in Earth and planetary interiors. Some solutions exhibit a negative temperature coefficient of solubility at high temperatures, thereby leading to salt precipitation with increasing temperature. Using modulated FT-IR Raman spectroscopy and classical molecular dynamics simulations (MD), we studied the solute speciation in solutions of 10 wt % Na2SO4, at conditions close to the saturation limit. Our experiments reveal that ion pairing and cluster formation are favored as solid saturation is approached, and ionic clusters form prior to the precipitation of solid sulfate. The proportion of such clusters increases as the phase boundary is approached either by decreasing pressure or by increasing temperature in the vicinity of the three-phase (vapor-liquid-solid) curve.

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“…This second type of phase behavior was observed in the system Si02 (Qz) -Na2Si205 (Ds) -H20 (see Fig. 4) and in the system K2S04-KLiS04-H20 [2]. Solubility isotherms in the system KzSO4-KLiS04-H20 (Fig.…”

Section: Ternary Systemsmentioning

confidence: 82%

Solubility and immiscibility behavior in ternary hydrothermal systems with critical phenomena in saturated solutions

Urusova

Valyashko

2001

High Pressure Research

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Phase Equilibria in Binary and Ternary Hydrothermal Systems

Cited by 23 publications

References 147 publications

Visual and in situ Raman spectroscopic observations of the liquid–liquid immiscibility in aqueous uranyl sulfate solutions at temperatures up to 420°C

Visual and in situ Raman spectroscopic observations of the liquid–liquid immiscibility in aqueous uranyl sulfate solutions at temperatures up to 420°C

Ion Association in Hydrothermal Sodium Sulfate Solutions Studied by Modulated FT-IR-Raman Spectroscopy and Molecular Dynamics

Solubility and immiscibility behavior in ternary hydrothermal systems with critical phenomena in saturated solutions

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