| Prediction of Solid-Liquid Equilibrium for KCl in Mixed Water-Ethanol Solutions Using the LIQUAC Model |
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| 作者姓名： | 林阳政 李继定 曾楚怡 陈翠仙 |
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| 作者单位： | Department of Chemical Engineering，Tsinghua University，Beijing 100084，China，Department of Chemical Engineering，Tsinghua University，Beijing 100084，China，Department of Chemical Engineering，Tsinghua University，Beijing 100084，China，Department of Chemical Engineering，Tsinghua University，Beijing 100084，China |
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| 基金项目： | Supported by the National Natural Science Foundation of China (No. 20276034), the National Key Basic Research Development (973) Program of China (No. 2003CB615701), and the National High-Tech Research and Development (863) Program of China (No. 2003AA328020) |
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| 摘 要： | Introduction The solubilities of nearly insoluble salts in water can be calculated directly using their solubility product constants, since at low ion concentrations the required activity coefficients are very close to unity. At higher concentrations, the mean activity coefficients of the ions have to be taken into account. In 1994, Li et al.1,2] developed the LIQUAC model for systems with strong electrolytes based on results from statistical thermodynamics taking into account the interact…
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Prediction of Solid-Liquid Equilibrium for KCl in Mixed Water-Ethanol Solutions Using the LIQUAC Model |
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| LIN Yangzheng,LI Jiding,ZENG Chuyi,CHEN Cuixian.Prediction of Solid-Liquid Equilibrium for KCl in Mixed Water-Ethanol Solutions Using the LIQUAC Model[J].Tsinghua Science and Technology,2005,10(5). |
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| Authors: | LIN Yangzheng LI Jiding ZENG Chuyi CHEN Cuixian |
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| Institution: | LIN Yangzheng,LI Jiding,ZENG Chuyi,CHEN Cuixian Department of Chemical Engineering,Tsinghua University,Beijing 100084,China |
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| Abstract: | The LIQUAC model is often used to predict vapor-liquid equilibria, osmotic coefficients, and mean ion activity coefficients for electrolyte systems. This paper describes a thermodynamic method to analyze solid-liquid equilibrium for electrolytes in mixed solvents solutions using the LIQUAC model. The KCl solubilities in mixed water-ethanol solutions are predicted with the LIQUAC model and its original interaction parameters. This method is also used to obtain new K+-ethanol interaction parameters in the LIQUAC model from the solubility data. The new interaction parameters accurately predict the vapor-liquid equilibrium data of K+ salts (including KCl, KBr, and KCOOCH3) in mixed water-ethanol solutions. The results illustrate the flexibility of the LIQUAC model which can predict not only vapor-liquid equilibrium but also solid-liquid equilibrium in mixed solvent systems. |
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| Keywords: | LIQUAC model solid-liquid equilibrium K+ salts mixed solvents |
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