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Solubility isotherms as well as the corresponding solid phases of the quaternary system LiCl+MgCl2+KCl+H2O and the eutectic points for the ternary systems LiCl+MgCl2+H2O, LiCl+KCl+H2O and MgCl2+KCl+H2O at 323.15 K have been elaborately determined by an isothermal equilibrium method. Five crystallization fields including two double salts (LiCl·MgCl2·7H2O(s) and KCl·MgCl2·6H2O(s)), two hydrate salts...
This study is part of a series of studies on the development of a multi-temperature thermodynamically consistent model for salt lake brine systems. Under the comprehensive thermodynamic framework proposed in our previous study, the thermodynamic properties of the binary systems (i.e., NaCl+H2O, KCl+H2O, MgCl2+H2O and CaCl2+H2O) are simulated by the Pitzer–Simonson–Clegg (PSC) model. Various thermodynamic...
Salt lake brine chemical engineering involves the study of the solid–liquid equilibria of more than one hundred water–salt systems and approximately 70 solid salts over a wide temperature range. Prediction of the crystallization behavior of these complex systems as a function of temperature can only be achieved using a thermodynamic model. However, no systematic simulation studies have been reported...
The phase diagram of the quaternary system LiCl–NaCl–KCl–H2O have been predicted with a Pitzer–Simonson–Clegg thermodynamic model by combining the binary and ternary model parameters, which were determined by simulating reliable experimental data. The predicted phase diagram shows a good agreement with the available experiment data from the literature. The other thermodynamic properties (e.g. water...
The phase diagram of the quaternary system KNO 3 –LiNO 3 –Mg(NO 3 ) 2 –H 2 O was simulated over the temperature range from 273 to 333 K by a Pitzer–Simonson–Clegg model, whose parameters were determined by fitting to experimental solubility and water activity data of the binary systems KNO 3 –H 2 O, LiNO 3 –H 2 O, Mg(NO 3...
Solubility isotherms of the ternary system (NH 4 Cl+CaCl 2 +H 2 O) were elaborately determined at T= (273.15 and 298.15) K by using the isothermal method. In the equilibrium phase diagram, there are two solubility branches corresponding to the solid phases CaCl 2 ⋅6H 2 O and NH 4 Cl. Invariant point compositions are 36.32 wt% CaCl 2 and 3.4 wt%...
From water activity data within the concentration range of molten salt hydrates the parameters r i and ε i of the modified Brunauer, Emmett and Teller (BET) equation have been determined for several salts i. The parameters were used to model the solid-liquid phase diagrams and to extract the temperature functions of the Gibbs energy of formation of all occurring solid phases with respect...
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