Solid-liquid equilibrium of Na + //Cl − , NO 3 − , SO 4 2− -H 2 O quaternary system at 373.15 K

Yang, Jing; Wang, Yanfei; Shu, Min; Yang, Libin; Zhu, Liang; Zhao, Xiaoyu; Zhou, Sha

doi:10.1016/j.fluid.2017.04.011

Cited by 14 publications

(13 citation statements)

References 11 publications

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“…On the basis of the XRD patterns, the invariant point C was verified to be a coexistence of NaCl and Na 2 SO 4. The system was still a simple eutectic type, and neither double salt nor solid solution was formed at 323.15 K. These diagrams also imply that the results of XRD characterization remain consistent with Schreinemaker’s method …”

Section: Results and Discussionmentioning

confidence: 99%

“…The coal chemical industry has been revived in recent years. − However, the high-salinity wastewater produced by the coal chemical industry has seriously restricted the development of the industry. , With the increasingly strict requirements of the “green industry” environment, the high-salinity wastewater emission reduction has gradually become the development trend of the coal chemical industry. , …”

Section: Introductionmentioning

confidence: 99%

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Determination of NaCl and Na₂SO₄ Equilibrium Solubility in Cyclohexanol and Cyclohexanone Aqueous Solutions at 323.15 K

Zhu

et al. 2020

J. Chem. Eng. Data

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The equilibrium solubility and physical properties (n D, η, and ρ) of NaCl and Na2SO4 in cyclohexanol and cyclohexanone aqueous solutions at 323.15 K were determined by an isothermal solution saturation method. According to the experimental data, the phase diagrams and diagrams of physical properties vs composition were plotted. The system of NaCl and Na2SO4 in cyclohexanol aqueous solution at 323.15 K can be divided into one invariant point, two univariant curves, and three crystallization regions. The physical properties of this system changed regularly with the change of the solubility of Na2SO4. The solubility of Na2SO4 and NaCl significantly reduced due to the presence of cyclohexanol in water. With the increase of the cyclohexanol content in aqueous solution in the system, the crystallization region of Na2SO4 increased obviously. The system of NaCl and Na2SO4 in cyclohexanone aqueous solution consisted of one invariant point, two univariant curves, and two crystallization regions corresponding to NaCl and Na2SO4. When Na2SO4 and NaCl were analyzed as 5.22 and 23.91 wt %, respectively, the solution reached saturation at 323.15 K. The presence of cyclohexanone in water has little effect on the solubility of Na2SO4 and NaCl. The equilibrium solids were verified by X-ray diffraction. It can be seen from the experimental results that the influence of the presence of organic impurity in water on the solubility of Na2SO4 and NaCl cannot be generalized. The measured data, especially the crystalline regions, could provide the fundamental basis, which would be of great value in designing and optimizing the crystallization process of NaCl and Na2SO4 in coal chemical high-salinity wastewater.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Determination of NaCl and Na₂SO₄ Equilibrium Solubility in Cyclohexanol and Cyclohexanone Aqueous Solutions at 323.15 K

Zhu

et al. 2020

J. Chem. Eng. Data

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“…There are three invariant points and five crystalline regions in this quaternary system. The three-dimensional phase diagram of the quaternion system is shown in Figure , which can clearly see the relationship between the quaternion system and its three ternary subsystems . In Figure , S′, L′, and N′ represent the solubility of manganese sulfate, ammonium sulfate, and magnesium sulfate, respectively.…”

Section: Results and Discussionmentioning

confidence: 99%

Solid–Liquid Phase Equilibrium of MnSO₄–MgSO₄–H₂O and (NH₄)₂SO₄–MnSO₄–MgSO₄–H₂O Systems at T = 303.15 K

2020

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In this study, the stable (solid + liquid) phase equilibrium and physical–chemical properties of the ternary MnSO4–MgSO4–H2O system at T = 303.15 K have been determined by the method of isothermal solution saturation. It is found that there are three crystalline regions, one unsaturated crystallization region, and one invariant point. The density and refractive index of this system were compared with the experimental values, and it is found that there is little difference between the two systems. The experimental solubility data were compared with the literature values, and the invariant points at different temperatures were fitted to provide data for the water-salt system containing manganese sulfate and magnesium sulfate. At the same time, the solubility data of the MnSO4–MgSO4–(NH4)2SO4–H2O system were determined by the same method, and the phase diagram was drawn. Comparing the actual phase diagram measured by the experiment with the predicted phase diagram obtained by means of translation method, it is found that they have the same crystallization regions. In order to see more clearly the relationship between the quaternary MnSO4–MgSO4–(NH4)2SO4–H2O system and its three ternary sub-systems (MnSO4–(NH4)2SO4–H2O, MgSO4–(NH4)2SO4–H2O, and MnSO4–MgSO4–H2O), we have plotted the related stereoscopic phase diagram. The research of this study provides the data basis for the crystallization process of manganese sulfate.

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“…In China, high-saline wastewater in the coal chemical industry usually has the typical components of sodium salts, which are determined by the raw coal properties and the processing technology. In general, Na 2 SO 4 and NaCl are the most two common ones, while sometimes NaNO 3 is also a non-negligible component. , Hence, related phase equilibrium investigations mainly focused on the quaternary salt–water system Na + //Cl – , NO 3 – , and SO 4 2– –H 2 O.…”

Section: Introductionmentioning

confidence: 99%

“…Because Na 2 SO 4 and NaCl are conventional inorganic salts existing in the classical systems such as salt lake brine and concentrated seawater, and the phase equilibrium investigations for the ternary system Na + //Cl – , and SO 4 2– –H 2 O are adequate, which cover the temperature range from 258.15 to 373.15 K under atmospheric pressure. − There are even equilibrium data reported at the conditions of higher temperatures and pressures up to 793.15 K and 130 MPa. − By contrast, the phase equilibrium investigations are relatively lacking for the systems containing NaNO 3 . To the best of our knowledge, Zhang and Huang measured the stable phase equilibrium data for the quaternary system Na + //Cl – , NO 3 – , and SO 4 2– –H 2 O at low temperature conditions of 258.15, 268.15, 273.15, and 278.15 K, while Bian et al and Yang et al reported its stable phase equilibrium data at high temperature conditions of 353.15 and 373.15 K, respectively. At the intermediate temperature, Lin et al studied the metastable phase equilibrium for the same system (298.15 and 323.15 K), while Cao et al measured the quaternary stable equilibrium data at 313.15 K. The reported data indicate that the quaternary system Na + //Cl – , NO 3 – , and SO 4 2– –H 2 O has various equilibrium characteristics at different temperatures.…”

Section: Introductionmentioning

confidence: 99%

Stable Solid–Liquid Equilibrium of the Quaternary System Na⁺//Cl^–, NO₃^–, and SO₄^2––H₂O at 333.15 K

Chen¹,

Bian

et al. 2019

J. Chem. Eng. Data

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The stable-phase equilibrium of the quaternary system Na + //Cl − , NO 3 − , and SO 4 2− −H 2 O and its ternary subsystems at 333.15 K was measured by the isothermal dissolution method. Different from the simple phase equilibrium of the systems at 353.15 K, there is double salt generated in the Na + //NO 3 − and SO 4 2− −H 2 O system at 333.15 K. The double salt was determined to be NaNO 3 •Na 2 SO 4 •H 2 O by combining the wet residual analysis and X-ray diffraction test. Based on this characteristic, the quaternary Na + //Cl − , NO 3 − , and SO 4 2− −H 2 O system has two invariant points and five univariant curves, which generate four fields corresponding to the crystallization of Na 2 SO 4 , NaCl, NaNO 3 and the double salt. The areas of the fields indicate that the single salts have the solubilities in the sequence of Na 2 SO 4 < NaCl < NaNO 3 . Meanwhile, the crystallization region of the double salt is relatively small, which indicates that the double salt will disappear when increasing the temperature further. Related results provide the important basis for the fractional crystallization process of high-saline wastewater in the coal chemical industry.

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Solid-liquid equilibrium of Na + //Cl − , NO 3 − , SO 4 2− -H 2 O quaternary system at 373.15 K

Cited by 14 publications

References 11 publications

Determination of NaCl and Na₂SO₄ Equilibrium Solubility in Cyclohexanol and Cyclohexanone Aqueous Solutions at 323.15 K

Determination of NaCl and Na₂SO₄ Equilibrium Solubility in Cyclohexanol and Cyclohexanone Aqueous Solutions at 323.15 K

Solid–Liquid Phase Equilibrium of MnSO₄–MgSO₄–H₂O and (NH₄)₂SO₄–MnSO₄–MgSO₄–H₂O Systems at T = 303.15 K

Stable Solid–Liquid Equilibrium of the Quaternary System Na⁺//Cl^–, NO₃^–, and SO₄^2––H₂O at 333.15 K

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Solid-liquid equilibrium of Na + //Cl − , NO 3 − , SO 4 2− -H 2 O quaternary system at 373.15 K

Cited by 14 publications

References 11 publications

Determination of NaCl and Na2SO4 Equilibrium Solubility in Cyclohexanol and Cyclohexanone Aqueous Solutions at 323.15 K

Determination of NaCl and Na2SO4 Equilibrium Solubility in Cyclohexanol and Cyclohexanone Aqueous Solutions at 323.15 K

Solid–Liquid Phase Equilibrium of MnSO4–MgSO4–H2O and (NH4)2SO4–MnSO4–MgSO4–H2O Systems at T = 303.15 K

Stable Solid–Liquid Equilibrium of the Quaternary System Na+//Cl–, NO3–, and SO42––H2O at 333.15 K

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Determination of NaCl and Na₂SO₄ Equilibrium Solubility in Cyclohexanol and Cyclohexanone Aqueous Solutions at 323.15 K

Determination of NaCl and Na₂SO₄ Equilibrium Solubility in Cyclohexanol and Cyclohexanone Aqueous Solutions at 323.15 K

Solid–Liquid Phase Equilibrium of MnSO₄–MgSO₄–H₂O and (NH₄)₂SO₄–MnSO₄–MgSO₄–H₂O Systems at T = 303.15 K

Stable Solid–Liquid Equilibrium of the Quaternary System Na⁺//Cl^–, NO₃^–, and SO₄^2––H₂O at 333.15 K