Development of a solution model to correlate solubilities of inorganic compounds in water vapor under high temperatures and pressures

Abstract

A solution model, based on the regular solution theory coupled with Flory-Huggins entropy term, was developed for the calculation of solubilities of inorganic compounds in water vapor under high temperatures and pressures. The solubilities of sodium chloride (NaCl), potassium hydroxide (KOH), sodium sulfate (Na 2 SO 4 ), lead oxide (PbO), silicon oxide (SiO 2 ), lithium nitrate (LiNO 3 ), sodium nitrate (NaNO 3 ) and potassium nitrate (KNO 3 ) were correlated by optimizing internal energies and molar volumes of inorganic compounds which give their solubility parameters.

Potential Explanations for the Inhibition and Acceleration of Phenol SCWO by Water

“…NaCl at this concentration is fully soluble in supercritical water at these conditions. 17,18 The absolute difference in the conversion of phenol at a given residence time for the two experimental profiles was less than (7%, which is within the (10% standard error for our equipment. 7 This result indicates that the destruction of phenol in SCWO is not controlled by reactions between ions.…”

Supercritical water oxidation: A technical review

“…Also some models have been developed to calculate the solubilities of inorganic salts in high-temperature-high-pressure steam of supercritical water. 107,113 NaCl and Na 2 SO 4 are considered model salts because they are the most frequent in the SCWO process and because of their different behaviors in the precipitation. The phase diagram of the aqueous solutions of NaCl at 25 MPa presents a LV region between 390 and 450°C, and the solid-vapor (SV) equilibrium region for temperatures Ͼ 450°C.…”

Measurement and correlation for solubilities of alkali metal chlorides in water vapor at high temperature and pressure

“…Namely, the solubility parameter given by Eq. (2) was fitted to the experimental solubility parameter: Shin et al [13]. In the present solution model, the solubility parameters of water were obtained by Eq.…”

“…The values of α 2 and β 2 were proposed by Shin et al [13] for sodium chloride. β 2 for potassium chloride and ∆u 2 for each salts were treated as adjustable parameters and optimized with the present data and literature data [3,5].…”