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Isopiestic Measurement of the Thermodynamics Properties for the Aqueous System LiBr-CaBr2-H2O at 373.15 K

Isopiestic Measurement of the Thermodynamics Properties for ...

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中国化学会第五届全国热分析动力学与热动力学学术会议

作者： Lingzong Meng Miroslaw S.Gruszkiewicz Tianlong Deng Yafei Guo Dan Li School of Chemistry and Chemical Engineering Linyi University Chemical Sciences Division Oak Ridge National Laboratory Tianjin University of Science and Technology

The isopiestic molalities for the systems LiBr-HO,CaBr-HO and LiBr-CaBr-HO were measured at 373.15 K with the isopiestic method using the Oak Ridge National Laboratory(ORNL)high-temperature gravimetric isopiestic apparatus[1].The osmotic coefficients and water activities were determined based on the lithium chloride,calcium chloride and sodium chloride reference *** behavior of the osmotic coefficients and the saturated vapor pressure for the ternary system as a function of molality was demonstrated.A chemical model for the LiBr-HO system that calculates solute and water activities,and solid-liquid equilibria from 273.15 to 523.15 K,was constructed by combining our experimental results with other experimental data available in the literature[2].The mixed ion-interaction parameters of θ and Ψ were fitted for ionic strengths to 36.0 mol·kg by using the least-square *** calculated osmotic coefficients for the ternary system agree well with the experimental *** thermodynamic data obtained in this study are essential for development of universal thermodynamic models for brine systems containing lithium bromide and calcium bromide.

关键词： Isopiestic method Osmotic coefficient water activity Pitzer model Lithium bromide

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Isopiestic Investigation of the Ternary System LiBO2 + Li2B4O7 + H2O and Representation with Pitzer Model

Isopiestic Investigation of the Ternary System LiBO2 + Li2B4...

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中国化学会第十九届全国化学热力学和热分析学术会议

作者： Kaiyu Zhao Yafei Guo Lingzong Meng Sanping Chen Tianlong Deng Tianjin Key Laboratory of Marine Resources and Chemistry College of Chemical Engineering and Materials ScienceTianjin University of Science and Technology College of Chemistry and Materials Science Northwest University School of Chemistry and Chemical Engineering Linyi University

Lithium borates not only occupy an important position in the modern inorganic industry,but also have been widely used in agriculture,metal smelting and chemical analysis for their excellent characteristics [1].In the west of china,some salt-lake brines contain abundant lithium and boron,and consist of several types of hydrated lithium borates *** to the complex structure of lithium borates,it is highly desirable to study the thermodynamic properties and behaviors of its aqueous electrolyte solution,and fully understand ion-interactions among each *** this work,water activities and osmotic coefficients for the ternary system(LiBO + LiBO + HO) and its subsystem at 288.15 K with various ionic strength 0.056-0.566 mol·kg were measured using an improved isopiestic *** experimental results were treated by the Pitzer ion-interaction model,then,a serious of parameters were obtained to describe the model.

关键词： Isopiestic method water activity Osmotic coefficients Pitzer model

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Phase Diagram of the System LiCl+NaCl+KCl+H2O at 298.15 and 323.15 K

Phase Diagram of the System LiCl+NaCl+KCl+H2O at 298.15 and ...

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第十六届全国化学热力学和热分析学术会议

作者： Hai-Tang Yang~1,De-Wen Zeng~1,Xia Yin~2,Teng-Yu Liang~1 1 College of Chemistry and Chemical Engineering,Central South University,Changsha 410083, 2 College of Chemistry and Chemical Engineering,Hunan University,Changsha 410082.

The phase diagram of the system LiCl+NaCl+KCl+HO is of great importance to the process of extracting LiCl from nature *** this work,the complete phase diagram of the system LiCl+NaCl+KCl+HO at 298.15(shown in Fig.1a) and 323.15 K(shown in Fig.1b) were predicted by Pitzer-Clegg- Simmoson(PSC) *** standard water activity and solubility data of binary systems LiCl+HO,NaCl+HO,KCl+HO and solubility data of ternary systems NaCl+KCl+HO, LiCl+KCl+HO,LiCl+NaCl+HO were fitted to obtain PSC model *** the solubility and water activity of three ternary systems NaCl+KCl+HO,LiCl+KCl+HO,LiCl+NaCl+HO and quaternary system LiCl+NaCl+KCl+HO were predicted over a wide range of temperature with the binary and ternary model ***,the experimental data of solubility and water activity of the system and sub-ternary system of LiCl+NaCl+KCl+HO was evaluated by checking the consistency of predicted data with the experimental *** predicted phase diagram proved to be trustworthy and reliable for the industrial process design of extracting LiCl from nature brine.

关键词： Pitzer-Simonson-Clegg Model LiCl+NaCl+KCl+H2O Solubility water activity Predicted

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Isopiestic measurement and solubility prediction of the ternary system MgCl2-NaCl-H2O

Isopiestic measurement and solubility prediction of the tern...

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第十七届全国化学热力学和热分析学术会议

作者： H.Han D.Li O.Dong L.Guo Y.Yao D.Zeng Qinghai Institute of Salt Lakes Chinese Academy of Sciences College of Chemistry and Chemical Engineering Central South University

The thermodynamic properties of the ternary system Mg Cl2-Na Cl-H2 O are instructive for magnesium chloride purification from crude bischofite in salt lakes. According to our experience, the sodium content in bischofite cannot be decreased by recrystallization method. In order to explain this abnormal phenomenon, we need profound understanding the multi-temperature phase diagram of the ternary system Mg Cl2-Na Cl-H2 O. Since the crystallization field of Mg Cl2·6H2O is very narrow, the determination of the eutectic line between the Mg Cl2·6H2O and Na Cl phases is a challenge. Although a lot of solubility experiments have been reported by many authors, a great discrepancy exists among them. So we determined the water activities of the system Mg Cl2-Na Cl-H2 O at 323.15 and 348.15 K, and constructed the phase diagrams and the eutectic line between the Mg Cl2·6H2O and Na Cl phases of the system Mg Cl2-Na Cl-H2 O with the Pitzer’s ion interaction model from 298.15 K to 373.15 K, as shown in Figure 1. We carried out purification test using a new fractional crystallization method according to the simulated results, the sodium content in bischofite decreased from 1.21 % to 0.17 %.

关键词： Solubility water activity Osmotic Thermodynamic model

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