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Tianlong Deng - One of the best experts on this subject based on the ideXlab platform.

  • Solid–Liquid Phase Equilibria of the Quaternary System (Li2SO4 + Na2SO4 + MgSO4 + H2O) at 288.15 K: Experimental and Model Simulation
    Journal of Chemical & Engineering Data, 2020
    Co-Authors: Shiqiang Wang, Yafei Guo, Fei Yuan, Xunian Han, Tianlong Deng
    Abstract:

    Solubility data for the quaternary system (Li2SO4 + Na2SO4 + MgSO4 + H2O) is very important for the separation of Lithium Sulfate from the salt lake brines in Qaidam Basin. The experimental and cal...

  • Solubilities, Densities and Refractive Indices in the Aqueous Quaternary System of Lithium Sulfate, Lithium Metaborate, and Lithium Carbonate at 288.15, 298.15, 308.15 K and 0.1 MPa
    Journal of Chemical & Engineering Data, 2016
    Co-Authors: Yafei Guo, Lina Cao, Shiqiang Wang, Tianlong Deng
    Abstract:

    Solubilities, densities and refractive indices of the aqueous quaternary system of Lithium Sulfate, Lithium metaborate, and Lithium carbonate at 288.15, 298.15, 308.15 K and 0.1 MPa were determined with isothermal dissolution method. According to the experimental results, the dry-salt phase diagrams, water-phase diagrams, and the diagrams of physicochemical properties including density, pH, and refractive index versus composition of Lithium Sulfate at three temperatures were plotted. In the dry-salt phase diagrams at three temperatures, there are four crystallization regions corresponding to Lithium metaborate octahydrate (LiBO2·8H2O, LB), Lithium carbonate (Li2CO3, LC), and Lithium Sulfate monohydrate (Li2SO4·H2O, LS), and three univariant-solubility curves corresponding to minerals of LS, LB, and LC, and one invariant point of three coexisted minerals (LS + LB + LC). A comparison of the phase diagrams at 288.15, 298.15, and 308.15 K shows that the areas of Lithium Sulfate monohydrate and Lithium metabor...

  • Metastable phase equilibria for the ternary aqueous system of Lithium Sulfate and potassium Sulfate at T = 308.15 K: Experimental data and prediction using Pitzer model
    Russian Journal of Inorganic Chemistry, 2016
    Co-Authors: Nan Zhang, Yafei Guo, Tianlong Deng
    Abstract:

    The metastable solubilities and the physicochemical properties including density, refractive index, pH and conductivity in the ternary system (Li2SO4 + K2SO4 + H2O) at T = 308.15 K were determined experimentally using the isothermal evaporation method, and the metastable phase diagram and the physicochemical properties versus composition diagram were plotted. In the metastable phase diagram, there are two invariant points, three univariant curves and three crystallization regions corresponding to Lithium Sulfate monohydrate (Li2SO4 · H2O), double salt (K2SO4 · Li2SO4) and arcanite (K2SO4). It was found that the double salt of K2SO4·Li2SO4 belongs to the incongruent double salt, and the hydrate of Li2SO4 · H2O belongs to hydrate type I. On the basis of Pitzer model of the electrolyte solution theory, the mixing-ion parameter of θLi,K, \({\Psi _{Li,K,S{O_4}}}\) and the metastable equilibrium constants of the solid phases K2SO4, Li2SO4 · K2SO4 and Li2-SO4 · H2O at 308.15 K were obtained for the first time. The calculated metastable solubility data for this ternary system at 308.15 K agree well with the experimental values, and this result indicates that the mixing-ion parameters and the metastable equilibrium constants obtained in this work are reliable.

  • metastable phase equilibria for the ternary aqueous system of Lithium Sulfate and potassium Sulfate at t 308 15 k experimental data and prediction using pitzer model
    Russian Journal of Inorganic Chemistry, 2016
    Co-Authors: Nan Zhang, Yafei Guo, Tianlong Deng
    Abstract:

    The metastable solubilities and the physicochemical properties including density, refractive index, pH and conductivity in the ternary system (Li2SO4 + K2SO4 + H2O) at T = 308.15 K were determined experimentally using the isothermal evaporation method, and the metastable phase diagram and the physicochemical properties versus composition diagram were plotted. In the metastable phase diagram, there are two invariant points, three univariant curves and three crystallization regions corresponding to Lithium Sulfate monohydrate (Li2SO4 · H2O), double salt (K2SO4 · Li2SO4) and arcanite (K2SO4). It was found that the double salt of K2SO4·Li2SO4 belongs to the incongruent double salt, and the hydrate of Li2SO4 · H2O belongs to hydrate type I. On the basis of Pitzer model of the electrolyte solution theory, the mixing-ion parameter of θLi,K, \({\Psi _{Li,K,S{O_4}}}\) and the metastable equilibrium constants of the solid phases K2SO4, Li2SO4 · K2SO4 and Li2-SO4 · H2O at 308.15 K were obtained for the first time. The calculated metastable solubility data for this ternary system at 308.15 K agree well with the experimental values, and this result indicates that the mixing-ion parameters and the metastable equilibrium constants obtained in this work are reliable.

  • metastable phase equilibrium in the aqueous ternary system li2so4 mgso4 h2o at 323 15 k
    Journal of Chemical & Engineering Data, 2011
    Co-Authors: Tianlong Deng, Dongchan Li
    Abstract:

    The metastable solubilities and physicochemical properties (densities and refractive index) of the aqueous ternary system (Li2SO4 + MgSO4 + H2O) at 323.15 K were determined by the isothermal evaporation method. According to the experimental results, the metastable phase diagram and the diagram of physicochemical properties versus composition were plotted. It was found that there are one eutectic point (Li2SO4·H2O + MgSO4·6H2O), two univariant curves, and two crystallization regions corresponding to Lithium Sulfate monohydrate (Li2SO4·H2O) and hexahydrite (MgSO4·6H2O) in the metastable ternary system. The system belongs to a simple eutectic type, and neither double salts nor solid solutions were found. It can be found that the solution density and refractive index of the metastable ternary system changed regularly with the content change of Lithium Sulfate, and all reach the maximum value at eutectic point. The calculated values of densities and refractive index with empirical equations are in good agreeme...

Teófilo A. Graber - One of the best experts on this subject based on the ideXlab platform.

  • Modeling of the density, viscosity and electrical conductivity of aqueous solutions saturated in boric acid in presence of Lithium Sulfate or sodium Sulfate at 293.15 to 313.15 K
    Fluid Phase Equilibria, 2021
    Co-Authors: Wilson Alavia, Jorge A. Lovera, Teófilo A. Graber, Daniela Azúa, Ismael Soto
    Abstract:

    Abstract The modeling of the density, viscosity and electrical conductivity of aqueous solutions saturated with boric acid, in the presence of sodium Sulfate or Lithium Sulfate, are presented. The salt concentrations range studied were from (0 to 3.3242) mol·kg−1 for sodium Sulfate and from (0 to 2.9336) mol·kg−1 for Lithium Sulfate at temperatures from (293.15 to 313.15) K and at 1 atm pressure. A model for the density was derived using the Pitzer model. The Eyring's absolute rate theory and the Pitzer model were combined to represent the viscosity. The Casteel-Amis equation was modified to describe the electrical conductivity with temperature and boric acid effects where necessary. The results showed that the models successfully represented the properties studied and are robust for estimation purposes within and beyond the experimental range studied. Also, it was found that short range interactions of boric acid, Sulfate, sodium and Lithium ions with water molecules are relevant to determine the volumetric and transport properties of these solutions and that the electrical conductivity is determined by charged species (Na+, SO42−, NaSO4−, HSO4− and Li+, SO42−, LiSO4−) and the solution viscosity; that is mainly influenced by these salts concentrations, boric acid solubility behavior with these salts and temperature. This is valuable information to improve the processes of boric acid production.

  • Thermodynamic modeling of the solubility of boric acid in the systems boric acid + Lithium Sulfate + water, boric acid + sodium Sulfate + water and boric acid + potassium Sulfate + water at 293.15–313.15 K
    Fluid Phase Equilibria, 2015
    Co-Authors: Wilson Alavia, Jorge A. Lovera, Teófilo A. Graber
    Abstract:

    Abstract In this contribution the experimental solubility of boric acid in sodium Sulfate aqueous solution was measured at different temperatures from (293.15 to 313.15) K, and Na2SO4 concentrations ranging from (0 to 3.3795) mol kg−1 H2O. The results were represented using an equation based on Pitzer model for the interactions of nonelectrolytes with electrolytes in aqueous solutions, given by Chanson and Millero (2006) [18]. The model parameter was estimated and validated estimating the solubility of boric acid in Lithium Sulfate, sodium Sulfate and potassium Sulfate aqueous solutions at different temperatures and salt concentrations. The model represented satisfactorily the data for the systems (SD = 0.033 mol kg−1 H2O for H3BO3 + Na2SO4 + H2O, SD = 0.020 mol kg−1 H2O for H3BO3 + Li2SO4 + H2O and SD = 0.030 mol kg−1 H2O for H3BO3 + K2SO4 + H2O). The model parameters are valid to maximum concentration of the salts, 3.380 mol kg−1 for Na2SO4, 3.149 mol kg−1 for Li2SO4 and 1.245 mol kg−1 for K2SO4 from 293.15 K to 313.15 K. Based on the results it was determined that Lithium Sulfate is a precipitant agent for boric acid and its behavior is attributed to the salting out effect of Li+ ion; sodium and potassium Sulfates increase the boric acid solubility; this salting in effect is due to the presence of Na+ and K+ ions. The presence of these salts can be unfavorable for the crystallization of boric acid due to the increase of solubility which decreases the supersaturation, therefore the yield of the process. Comparing the parameters for the system H3BO3 + Na2SO4 + H2O, H3BO3 + Li2SO4 + H2O and H3BO3 + K2SO4 + H2O, it was found that effect of these ions on the decreasing of the solubilty of boric acid in aqueous Sulfate solutions follows the order: Li+ > Na+ > K+, which can be attributed to the increase of their ionic radii, coordinated with 6 water molecules therefore the capacity to form hydration shells.

  • liquid liquid equilibrium of the aqueous two phase system water peg 4000 Lithium Sulfate at different temperatures experimental determination and correlation
    Journal of Chemical & Engineering Data, 2004
    Co-Authors: Teófilo A. Graber, And Maria E. Gálvez, Héctor R. Galleguillos, Javier Alvarezbenedi
    Abstract:

    A study was made of the effect of temperature on the liquid−liquid equilibrium (LLE) in the aqueous biphasic system formed by Lithium Sulfate + polyethylene glycol 4000 + water at 5, 25, and 45 °C. The tie lines and binodal curves as well as the densities and refractive indexes were determined on solutions in equilibrium at each temperature. The LLE experimental data obtained were well correlated to the nonrandom two-liquid thermodynamic model for activity coefficients. When using data from seven equilibrium lines for each temperature, a mean deviation of 1.07% was obtained between experimental compositions and compositions calculated using the model.

  • Liquid−Liquid Equilibrium of the Aqueous Two-Phase System Water + PEG 4000 + Lithium Sulfate at Different Temperatures. Experimental Determination and Correlation
    Journal of Chemical & Engineering Data, 2004
    Co-Authors: Teófilo A. Graber, And Maria E. Gálvez, Héctor R. Galleguillos, Javier Álvarez-benedí
    Abstract:

    A study was made of the effect of temperature on the liquid−liquid equilibrium (LLE) in the aqueous biphasic system formed by Lithium Sulfate + polyethylene glycol 4000 + water at 5, 25, and 45 °C. The tie lines and binodal curves as well as the densities and refractive indexes were determined on solutions in equilibrium at each temperature. The LLE experimental data obtained were well correlated to the nonrandom two-liquid thermodynamic model for activity coefficients. When using data from seven equilibrium lines for each temperature, a mean deviation of 1.07% was obtained between experimental compositions and compositions calculated using the model.

Luis Antonio Minim - One of the best experts on this subject based on the ideXlab platform.

Angel Carton - One of the best experts on this subject based on the ideXlab platform.

Dongchan Li - One of the best experts on this subject based on the ideXlab platform.

  • metastable phase equilibrium in the aqueous ternary system li2so4 mgso4 h2o at 323 15 k
    Journal of Chemical & Engineering Data, 2011
    Co-Authors: Tianlong Deng, Dongchan Li
    Abstract:

    The metastable solubilities and physicochemical properties (densities and refractive index) of the aqueous ternary system (Li2SO4 + MgSO4 + H2O) at 323.15 K were determined by the isothermal evaporation method. According to the experimental results, the metastable phase diagram and the diagram of physicochemical properties versus composition were plotted. It was found that there are one eutectic point (Li2SO4·H2O + MgSO4·6H2O), two univariant curves, and two crystallization regions corresponding to Lithium Sulfate monohydrate (Li2SO4·H2O) and hexahydrite (MgSO4·6H2O) in the metastable ternary system. The system belongs to a simple eutectic type, and neither double salts nor solid solutions were found. It can be found that the solution density and refractive index of the metastable ternary system changed regularly with the content change of Lithium Sulfate, and all reach the maximum value at eutectic point. The calculated values of densities and refractive index with empirical equations are in good agreeme...