Measurement and thermodynamic model study on solid+liquid equilibria and physicochemical properties of the ternary system MgBr2+MgSO4+H2O at 323.15K

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The solubilities in the quaternary system NaCl–KCl–SrCl2–H2O and its subsystem KCl–SrCl2–H2O at 288.15 K were investigated with the isothermal dissolution method. The phase diagram of the ternary system is composed of two single-salt crystallizations for KCl and SrCl2·6H2O, two solubility univariant curves, and one cosaturated point. The dry-salt diagram of the quaternary system consists of three single-salt crystallization fields for NaCl, KCl, and SrCl2·6H2O, three solubility univariant curves, and one invariant point. By combination of the determined solubilities and Pitzer binary parameters obtained in the literature, the lacking Pitzer mixing parameters θNa,Sr, θK,Sr, ΨNa,Sr,Cl, and ΨK,Sr,Cl and the solubility product constants of the solid salts for the systems were fitted on the basis of the Pitzer model. The model was then used to calculate the solubilties of the two systems. The theoretical results calculated using the model coincide with the experimental values.

Section: Introductionmentioning

confidence: 99%

Experimental Determination and Thermodynamic Modeling of Solid–Liquid Equilibria in the Quaternary System NaCl–KCl–SrCl₂–H₂O at 288.15 K

Meng

Wang

et al. 2018

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“…Figure shows the comparison concerning the solubilities for the ternary MgBr 2 –MgSO 4 –H 2 O system at 273.15, 288.15, 298.15, 308.15, 323.15, 333.15, and 348.15 K. These solubility curves show nearly the same tendency. There is a gradual fall in the solubility of MgSO 4 with the increasing solubility of MgBr 2 at any temperature given.…”

Section: Resultsmentioning

confidence: 75%

“…One reason is the dehydration of magnesium sulfate hydrate with the increase in temperature. The other one may be that high temperature results in the growth of MgBr 2 solubility, which further leads to its stronger water absorption …”

Section: Resultsmentioning

confidence: 99%

“…The main information associated with the crystallization regions and invariant points is imperfect, which could not be used to design an effective separation process. To overcome these shortcomings, the solubilities of this system have been investigated at 288.15, 323.15, and 333.15 K for the extraction of bromine from bittern in recent years. − It is found that the solubility of MgBr 2 and the dry salt percentage of MgBr 2 at invariant points increase with the increasing temperature, which means that the purity of the MgBr 2 product tends to be higher. Currently, the largest dry salt ratio of MgBr 2 at the invariant point is only 98.44% at 333.15 K, which is not satisfactory for the high-purity standard of the MgBr 2 product.…”

Section: Introductionmentioning

confidence: 99%

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Solid–Liquid Equilibrium in the Ternary MgBr₂–MgSO₄–H₂O System at 348.15 K and Its Application

Guo

Cao

2021

The solid−liquid equilibrium of the ternary MgBr 2 −MgSO 4 − H 2 O system at 348.15 K was explored by using the isothermal equilibrium method, intending to realize the comprehensive utilization of the basic magnesium bromide (MgBrOH) waste residue produced in maltol production. It was observed that the phase diagram was composed of four single-salt crystallization regions, four univariate solubility curves, three invariant points saturated with

“…The results showed that the average activity coefficients of chloride or bromide of magnesium and calcium are much larger than those of chloride or bromide for sodium and potassium and can reach tens to hundreds at the saturation molality . The calculated mean activity coefficients of MgBr 2 and MgSO 4 against molality in the ternary solutions up to the saturation molality at 323.15 K have been discussed by Meng et al, which indicated that mean activity coefficients of MgBr 2 and MgSO 4 have large values owing to their highly soluble properties …”

Section: Resultsmentioning

confidence: 87%

Experiment and Calculation of Solid–Liquid Phase Equilibria in the Ternary System SrCl₂–SrBr₂–H₂O at T = 273, 298, and 323 K

Zhang

Zhao

et al. 2020

This work describes the solid−liquid phase equilibria in the ternary system SrCl 2 −SrBr 2 −H 2 O at T = 273, 298, and 323 K based on the method of isothermal dissolution equilibrium. Since saturated liquid phases and humid residue compositions for a series of synthetic brines were determined simultaneously, the measured equilibrium tie lines were constructed. At the same time, the corresponding equilibrium solid phases were identified by using the Schreinemakers' method supplemented with X-ray powder diffraction. The experimental phase diagrams of the system SrCl 2 −SrBr 2 −H 2 O at T = 273, 298, and 323 K were established according to the theory of phase diagram for water salt system. It is found that the type of the system is classified as completely solid solution type due to formation of solid solution Sr(Cl, Br) 2 •6H 2 O. The phase diagrams of the ternary system SrCl 2 −SrBr 2 −H 2 O at 273, 298, and 323 K are constituted of one univariant solubility curve and one solid crystalline phase region corresponding to Sr(Cl, Br) 2 •6H 2 O, without any invariant point. The Pitzer equation was selected to calculate the solubility data in the ternary system SrCl 2 −SrBr 2 −H 2 O at T = 273, 298, and 323 K. The solubility modeling approach achieved good agreement with experimental solubility data.