JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
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IF 2.196
Yunxue Gao,Shuni Li,Quanguo Zhai,Yucheng Jiang,Mancheng Hu
The (solid + liquid) phase equilibrium of the ternary system (NaCl + RbCl + H 2 O) at T = (288.15, 298.15 and 308.15) K was studied by the method of isothermal solution saturation. Moreover, the density and refractive index of the solution was also determined. The solid phase was studied by the Schreinemaker’s wet residue method and verified by X-ray diffraction. The results show that each of the phase diagrams contains one invariant point, two univariant curves, and three crystallization regions. The crystallization region of NaCl increased obviously with the temperature increasing, while the crystallization regions of RbCl and the mixed crystallization region of (NaCl + RbCl) decreased a little. Furthermore, there are break points at the invariant points for density and refractive index curves.
研究领域:
化学
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材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2019
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IF 2.298
Chao Ye,Zhong-Zhong Wu,Shi-Hua Sang,Xiao-Yun Qi,Xing Liu
The solid–liquid phase equilibria of the ternary system KBr–LiBr–H2O at 273 and 308 K were determined by the isothermal dissolution equilibrium method. On the basis of the obtained experimental data, the stable phase diagrams of ternary system KBr–LiBr–H2O at 273 and 308 K were plotted, respectively. The results show that the ternary system is a simple cosaturated type at two different temperatures, and there is neither a solid solution nor a double salt in the system. Both of the phase diagrams include one invariant point, two univariant curves, and two crystalline regions (where the solids are LiBr·2H2O and KBr, respectively). The crystalline area of KBr is much larger than that of LiBr·2H2O, indicating that the solubility of KBr is much smaller than that of LiBr in the ternary system. The mass fraction of KBr in the equilibrium liquid phase is obviously reduced, which indicates that LiBr has a strong salting-out effect on KBr.
研究领域:
化学热力学
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无机化学
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2023
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IF 2.6
Liwei Zhuang,Qinqin Hu,Shujing Wang,Ruyi Lin,Dan Li,Yong Ma,Lingzong Meng,Jiaoyu Peng
The solid–liquid phase equilibria of brine systems containing boric acid are the theoretical basis for the development of boric acid from brine resources. The phase equilibria of the systems NaCl–CaCl2–H3BO3–H2O and CaCl2–H3BO3–H2O at 323.15 K were investigated by the isothermal solution method. The phase diagram for the ternary system is composed of one co-saturation point, two univariant solubility curves, and two singe-salt crystallization fields of CaCl2·2H2O and H3BO3. The dry-salt phase diagram for the quaternary system consists of one invariant point, three univariant solubility curves, and three single-salt crystallization fields for NaCl, CaCl2·2H2O, and H3BO3. In the phase diagrams of the quaternary system at 298.15 and 323.15 K, the areas of sodium chloride and calcium chloride salt regions are enlarged, whereas the area of the H3BO3 region is diminished significantly with the increase of temperature. Using the Pitzer model, the lacking Pitzer parameters for H3BO3 were obtained by fitting the solubilities in the CaCl2–H3BO3–H2O system. The calculated solubilities with the Pitzer model were in accord with the experimental data.
研究领域:
化学热力学
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无机化学
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高影响因子
Journal of Sustainable Metallurgy
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2023
·Vol. 9
·期 3
·1303-1314
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IF 2.4
Lv Ningning,Qiu Yuchao,Hu Yiming,Shi Hangkai,Shi Junjie,Ding Xiang,Li Haolun
It has been proved that Cr 2 O 3 is favorable to promote the crystallization of perovskite in the Selective Crystallization and Phase Separation (SCPS) process. However, the related thermodynamic data of equilibrium phase relations was quite limited. In the present work, the equilibrium phase relations of CaO-SiO 2 -TiO 2 system with the addition of 5 wt% Cr 2 O 3 were experimentally carried out using the high temperature equilibration-quenching technique followed by X-Ray Diffraction (XRD), Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM–EDS), as well as thermodynamic calculation. More attention has been focused on the influence of 5 wt% Cr 2 O 3 addition on the liquid-perovskite two-phase coexisting region. The results indicated that the crystallization of perovskite was promoted by Cr 2 O 3 addition by expanding the primary phase of perovskite toward higher SiO 2 areas. Meanwhile, distinct discrepancies were found when the present experimental results were compared with the data from the literature and the isotherms calculated by FactSage, indicating that the present results are not only meaningful for the improvement of the SCPS process, but also important for the optimization of titania related oxide thermodynamic database. Graphical Abstract
研究领域:
冶金学
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材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2024
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IF 2
Honglin Xu,Yongsheng Deng,Xinyu Wang,Ruilin Wang
The stable phase equilibrium of the ternary system NaVO3–KVO3–H2O at 298.15 K was investigated using the isothermal solution equilibrium method and the Schreinemaker wet residue method. The equilibrium liquid phase solubility data and physical property data [density (ρ), refractive index (nD), pH] were determined, and X-ray diffraction was utilized to verify the material composition of the equilibrium solid phase. Phase diagrams and physical property–composition diagrams were constructed based on the equilibrium solubility data and physical property data. The results show that the ternary system has a complex salt generation process with two invariant points, three univariate curves, and three crystalline phase regions corresponding to NaVO3·2H2O, KVO3, and Na2mKn(VO3)2m+n, respectively. The solid phase precipitated from a saturated NaVO3 solution at 298.15 K is NaVO3·2H2O, as confirmed by a comparison of experimental results and the literature. The chemical composition of the complex salt generated from the NaVO3–KVO3–H2O ternary system follows the general formula of the Na2mKn(VO3)2m+n complex salt proposed by Druzynski’s group, thereby validating the reliability of the present experiment. This study provides new experimental data for the preparation and separation of metavanadate.
研究领域:
化学热力学
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材料科学
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DOI
高影响因子
Processes
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2022
·Vol. 10
·期 5
·823
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IF 3.352
Bin Li,Xinjun Jing,Junsheng Yuan
The phase equilibria of the reciprocal quaternary system LiBr-Li2SO4-KBr-K2SO4-H2O and its ternary sub-systems LiBr-Li2SO4-H2O and KBr-K2SO4-H2O at 308.15 K were studied using the isothermal dissolution equilibrium method. Then, the solubility data of the equilibrium solutions were collected, and the phase diagrams were plotted. The phase diagrams of the ternary sub-systems at 308.15 K were compared with those at other temperatures. This study found that the phase diagram of the LiBr-Li2SO4-H2O system at 308.15 K consisted of an invariant point, two solid-phase crystallization regions of Li2SO4·H2O and LiBr·2H2O, and their corresponding solubility curves. The system generated two hydrated salts, which belonged to the hydrate type I phase diagram. The phase diagram of the KBr-K2SO4-H2O system at 308.15 K consisted of an invariant point, two univariant solubility curves, and two solid-phase crystallization regions of KBr and K2SO4, and no solid solution and double salts were formed. Thus, it belonged to a simple co-saturation type phase diagram. In the LiBr-Li2SO4-KBr-K2SO4-H2O system, K2SO4·Li2SO4double salt formed at 308.15 K, and the phase diagram consisted of three invariant points, five crystallization regions, and seven univariant solubility curves.Keywords:lithium bromide;potassium bromide;lithium sulfate;potassium sulfate;phase equilibrium
研究领域:
化学
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材料科学
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高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2016
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IF 2.196
Lijiang Guo,Haijun Han,Ouyang Dong,Yan Yao
Water activities of the high concentration solid solution-aqueous solution system (SS-AS) KCl–RbCl–H 2 O and its sub-binary systems at T = 298.15 K and T = 323.15 K have been elaborately measured by an isopiestic method. The solubility of this ternary system at T = (298.15, 308.15 and 323.15) K was also measured by a Flow-Cloud-Point method. A Pitzer model was used to estimate the reliability of the solubility reported in the literature, and to judge the type of solid phase, by correlating the measured water activity and the reported solubility values. The binary model parameters as a function of temperature between T = 298.15 K and T = 323.15 K were obtained by fitting the water activities in the binary systems. The predicted water activities at T = 298.15 K and T = 323.15 K with the obtained binary parameters only, are in good agreement with the experimental values, which indicate that the Pitzer model can reliably represent the properties of the ternary system, with binary parameters only within the temperature range from T = 298.15 K to T = 323.15 K. Under the different assumptions that the equilibrium solid phase involved the pure salts (KCl (s) and RbCl (s) ) for the ideal solid solution or regular solid solution (K, Rb)Cl (ss) , the solubility isotherms at T = (298.15, 308.15 and 323.15) K were calculated and compared to experimental results, respectively. It was found that only the calculated solubility isotherms for (K, Rb)Cl (ss) regular solid solution are consistent with the corresponding experimental values. The solid phase equilibrated with the aqueous solution in the KCl–RbCl–H 2 O ternary system should be a regular solid solution (K, Rb)Cl (ss) . This conclusion also can be verified from the Lippman log ∑ K − X s − X act and Φ ∑ m − X s − X aq equilibrium diagrams.
研究领域:
物理化学
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热力学
✓ 已验证
DOI
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2023
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IF 4.5
Miao TIAN,Qiong-qiong WANG,Qin-meng WANG,Wei LI,Xue-yi GUO
The effect of MgO on the phase equilibria between matte and tridymite-saturated FeO x −SiO 2 −MgO slag was investigatedusing high-temperature equilibration and microanalysis technique. The results showed that at 1300 °C and p (SO 2 ) of 10 kPa, the presence of MgO reduced the FeO activity of the slag, leading to the decrease in the oxygen partial pressure ( p (O 2 )) over the slag and the Cu solubility in the slag. Due to the lower FeO activity, FeS was oxidized from matte into slag, increasing the Cu concentration of the matte. In high-SiO 2 concentrationslags, excessive MgO in the liquid slag recrystallized as solid olivine (Mg 2 SiO 4 −Fe 2 SiO 4 ), increasing the slag viscosity and copper losses in the slag. The maximum MgO solubility in the FeO x −SiO 2 −MgO slag increased from 3 wt.% to 8 wt.% when the temperature raised from 1200 to 1300 °C under p (O 2 ) of 10 −6 kPa. At higher MgO content, the slag composition could be optimized by increasing temperature and adding SiO 2 flux to maintain a fully molten slag or avoid high proportions of solids.
研究领域:
冶金学
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材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
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2020
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IF 2.888
Xia Wang,Kaiyu Zhao,Yafei Guo,Lingzong Meng,Tianlong Deng,Dan Li
The solid–liquid phase equilibria of systems LiCl–NaCl–CaCl 2 –SrCl 2 –H 2 O and CaCl 2 –SrCl 2 –H 2 O at 273.15 K and 0.1 MPa were investigated with the isothermal equilibrium method. The solid–liquid equilibrium phase diagrams were constructed with the experimental solubilities. The phase diagram in the ternary system consists of one univariant solubility curve saturated with solid solution (Ca,Sr)Cl 2 ·6H 2 O, and one crystallization field of the solid solution. There are three invariant points, seven isothermal univariant curves, and five crystallization regions saturated with NaCl corresponding to (Ca,Sr)Cl 2 ·6H 2 O, SrCl 2 ·2H 2 O, LiCl·2H 2 O, CaCl 2 ·4H 2 O and LiCl·CaCl 2 ·5H 2 O in the dry-salt diagram of the quinary system. The areas of crystallization zones decrease according to the above order. The J (NaCl), J (H 2 O), refractive index and density of the solution gradually change regularly with the increasing of J (CaCl 2 ) in the solution. These results on phase diagrams of the quinary system can supply theoretical reference for lithium salts and strontium salts separation from calcium chloride type brine.
研究领域:
化学
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材料科学
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DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2021
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IF 2.694
Fei Yuan,Hua Li,Long Li,Yafei Guo,Shiqiang Wang,Tianlong Deng
Considering the significance of fundamental phase equilibrium data in resource exploitation from salt lake brines, the solid–liquid phase equilibria of the ternary system (KBO2 + K2SO4 + H2O) at 288.15, 308.15 K, and 0.1 MPa were investigated using the isothermal dissolution method. Along this line, the solubilities and physicochemical properties of densities were experimentally determined. Based on the experimental data, phase diagrams and the related physicochemical property diagrams against composition were plotted. It was found that there are one invariant point, two univariate solubility curves, and two crystalline regions corresponding to potassium metaborate hydrate (KBO2·1.33H2O) and arcanite (K2SO4) in the ternary phase diagrams at 288.15 and 308.15 K. In addition, they belong to the hydrate type I and neither double salt nor solid solution was formed. The distributive behaviors of density against the concentration of KBO2 in the equilibrium solution at two temperatures were similar. Moreover, the theoretical values of density were calculated, which were found to be consistent with the experimental values, further demonstrating the accuracy and reliability of this work.
研究领域:
化学
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物理化学
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高影响因子
FLUID PHASE EQUILIBRIA
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2023
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IF 2.6
Qing Zhang,Danru Xu,Miaoli Hao,Zhiqiang Wu,Chunhai Yi,Jingjun Liu
Solketal obtained by ketalization of glycerol with acetone is a value-added glycerol derivative that can be used as a solvent, plasticizer and fuel additive. Phase splitting and merging exist in the ketalization due to the low solubilities of the two reactants. The liquid-liquid equilibrium data for a quaternary system (glycerol – acetone – solketal – water) involved in the ketalization were measured at reaction-relevant temperatures (303.2 K, 308.2 K, and 313.2 K) and atmospheric pressure. The equilibrium data were correlated using the NRTL model to calculate activity coefficients, to estimate the binary interaction parameters. The NRTL model with the regressed parameters could reproduce the phase equilibrium behavior of the studied system.
研究领域:
化学工程
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物理化学
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DOI
高影响因子
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
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2024
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IF 1.8
Jia-Yue Wang,Chen Yan,Han Sen-Jian,Guo Ya-Fei,Wang Shi-Qiang
To achieve efficient separation of alkali metal borate resources from the brines of the salt lake to provide a theoretical basis, this paper adopts the isothermal dissolution equilibrium method to study the solid-liquid phase equilibrium and phase diagram of the ternary system (LiB 5 O 8 + KB 5 O 8 + H 2 O) and (LiB 5 O 8 + NaB 5 O 8 + H 2 O) at 288.15 K. The study grasps the changing law of solubility and physicochemical properties of the system, as well as analyses and identifies the solid phase in stable equilibrium. The results show that the stable phase diagrams of the two ternary systems at 288.15 K are of the simple eutectic type, containing one invariant point, two univariate saturated solubility curves, and two crystalline regions. Among them, the crystalline region of LiB 5 O 8 ·5H 2 O is the smallest, indicating that it is not easy to precipitate from the saturated liquid phase, and the density and refractive index curves of each system show regular changes with the increase of LiB 5 O 8 content.
研究领域:
化学
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材料科学
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高影响因子
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