Isothermal Solubility of Na&lt;sub&gt;2&lt;/sub&gt;B&lt;sub&gt;4&lt;/sub&gt;O&lt;sub&gt;7&lt;/sub&gt;-Na&lt;sub&gt;2&lt;/sub&gt;CO&lt;sub&gt;3&lt;/sub&gt;-NaHCO&lt;sub&gt;3&lt;/sub&gt;-NaBO&lt;sub&gt;2&lt;/sub&gt;-H&lt;sub&gt;2&lt;/sub&gt;O System at 25， 35 and 45 ℃

The metastable phase equilibria of the quinary system NaCl + Na2CO3 + Na2B4O7 + KCl + K2CO3 + K2B4O7 + H2O were studied at 273.15 K using an isothermal evaporation method. The solubilities and densities of the equilibrated solution in this system were determined. On the basis of the experimental data, the stereo metastable phase diagram and the projected phase diagram saturated with the salt Na2B4O7 of the quinary system at 273.15 K were constructed. In the space diagram there are seven crystallization fields corresponding to the crystalline phase regions of KCl, NaCl, K2B4O7·4H2O, Na2B4O7·10H2O, Na2CO3·10H2O, K2CO3·3/2H2O, and K2CO3·Na2CO3·12H2O. The projected phase diagram saturated with sodium borate consists of five crystallization fields, seven univariant curves, and three invariant points. The five crystallization fields correspond to NaCl, KCl, K2B4O7·4H2O, Na2CO3·10H2O, and K2CO3·Na2CO3·12H2O. The forms of sodium and potassium borate are Na2B4O5(OH)4·8H2O and K2B4O5(OH)4·2H2O, respectively. The forms of potassium carbonate, sodium carbonate, and double salt are K2CO3·3/2H2O, Na2CO3·10H2O, and K2CO3·Na2CO3·12H2O; comparing with the phase diagram of the subsystems containing sodium carbonate and potassium carbonate, they have the same crystallization forms.

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Thermodynamics Phase Equilibria for the System Containing Lithium, Sodium, Chloride, and Carbonate in Aqueous Solution at 273.15 K

Zeng

et al. 2013

J. Chem. Eng. Data

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The mixed aqueous electrolyte system containing lithium, sodium, chloride, and carbonate has been investigated using the isothermal evaporation method at 273.15 K. The stereophase diagram and the planar projection diagram have been constructed based on the Jänecke method. The compositions of the equilibrated solid phases and liquid phase corresponding to equilibrium points were measured. The system contained only four single salts, sodium chloride (NaCl), lithium chloride monohydrate (LiCl·H2O), lithium carbonate (Li2CO3), and sodium carbonate decahydrate (Na2CO3·10H2O). Salt LiCl has a strong salting-out effect on the other salts. The density coefficients Ai which were used for the calculation of density at 273.15 K were obtained by fitting. The calculated values of density using an empirical equation have a maximum relative error less than 0.020.

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Isothermal Solubility of Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub>-Na<sub>2</sub>CO<sub>3</sub>-NaHCO<sub>3</sub>-NaBO<sub>2</sub>-H<sub>2</sub>O System at 25， 35 and 45 ℃

Cited by 5 publications

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Borax preparation from Na-B-Si-containing solution by carbonation and multi-step crystallization

Borax preparation from Na-B-Si-containing solution by carbonation and multi-step crystallization

Metastable Equilibria of the Quinary System NaCl + Na₂CO₃ + Na₂B₄O₇ + KCl + K₂CO₃ + K₂B₄O₇ + H₂O at 273.15 K

Thermodynamics Phase Equilibria for the System Containing Lithium, Sodium, Chloride, and Carbonate in Aqueous Solution at 273.15 K

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Isothermal Solubility of Na<sub>2</sub>B<sub>4</sub>O<sub>7</sub>-Na<sub>2</sub>CO<sub>3</sub>-NaHCO<sub>3</sub>-NaBO<sub>2</sub>-H<sub>2</sub>O System at 25， 35 and 45 ℃

Cited by 5 publications

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Borax preparation from Na-B-Si-containing solution by carbonation and multi-step crystallization

Borax preparation from Na-B-Si-containing solution by carbonation and multi-step crystallization

Metastable Equilibria of the Quinary System NaCl + Na2CO3 + Na2B4O7 + KCl + K2CO3 + K2B4O7 + H2O at 273.15 K

Thermodynamics Phase Equilibria for the System Containing Lithium, Sodium, Chloride, and Carbonate in Aqueous Solution at 273.15 K

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Product

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Metastable Equilibria of the Quinary System NaCl + Na₂CO₃ + Na₂B₄O₇ + KCl + K₂CO₃ + K₂B₄O₇ + H₂O at 273.15 K