| Phase Equilibria in the Ternary Systems KBr–K2B4O7–H2O and KCl–K2B4O7–H2O at 373 K |
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| 作者姓名： | CUI Ruizhi SANG Shihu HU Yongxi and HU Jiawen |
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| 作者单位： | 1 College of Materials, Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China;2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, China;3 Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu 610059, China;4 College of Resources, Shijiazhuang University of Economics, Shijiazhuang 050031, China |
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| 基金项目： | Acknowledgments We thank reviewers for their valuable comments and suggestions. This project was supported by the Open Fund （PLC201204） of State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation （Chengdu University of Technology）, the National Natural Science Foundation of China （Grant No. 41373062, 40973047, 41172118）, the Specialized Research Fund （20125122110015） for the Doctoral Program of Higher Education of China, and the youth science and technology innovation team of Sichuan Province, China（2013TD0005）. |
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| 摘 要： | According to the compositions of the underground gasfield brines in the west of Sichuan Basin,the phase equilibria in the ternary systems KBr-K2B4O7-H2O and KCl-K2B4O7-H2O at 373 K were studied using the isothermal dissolution equilibrium method.The solubilities of salts and the densities of saturated solutions in these ternary systems were determined.Using the experimental data,phase diagrams and density-composition diagrams were constructed.The two phase diagrams were simple co-saturation type,each having an invariant point,two univariant curves and two crystallization regions.The equilibrium solid phases in the ternary system KBr-K2B4O7-H2O are potassium bromide （KBr） and potassium tetraborate tetrahydrate （K2B4O7·4H2O）,and those in the ternary system KCl-K2B4O7-H2O are potassium chloride （KCl） and potassium tetraborate tetrahydrate （K2B4O7·4H2O）.Comparisons of the phase diagrams of the two systems at different temperatures show that there is no change in the crystallization phases,but there are changes in the size of the crystallization regions.As temperature increases,the solubility of K2B4O7·4H2O increases rapidly,so the crystallization field of K2B4O7·4H2O becomes smaller.
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| 关 键 词： | 三元体系 相平衡 等温溶解平衡法 饱和溶液 结晶区域 四硼酸钾 四川盆地 地下卤水 |
| 收稿时间： | 2012/9/21 0:00:00 |
| 修稿时间： | 8/8/2013 12:00:00 AM |
Phase Equilibria in the Ternary Systems KBr-K2B4O7-H2O and KCl-K2B4O7-H2O at 373 K |
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| Authors: | CUI Ruizhi SANG Shihua HU Yongxia HU Jiawen |
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| Institution: | [1]College of Materials, Chemistry ＆ Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China [2]State Key Laboratory of Oil and Gas Reservoir Geology andExploitation, Chengdu University of Technology, Chengdu 610059, China [3]Mineral Resources Chemistry Key Laboratory of Sichuan Higher Education Institutions, Chengdu 610059, China [4]College of Resources, Shijiazhuang University of Economics, Shijiazhuang 050031, China |
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| Abstract: | According to the compositions of the underground gasfield brines in the west of Sichuan Basin, the phase equilibria in the ternary systems KBr–K2B4O7–H2O and KCl–K2B4O7–H2O at 373 K were studied using the isothermal dissolution equilibrium method. The solubilities of salts and the densities of saturated solutions in these ternary systems were determined. Using the experimental data, phase diagrams and density‐composition diagrams were constructed. The two phase diagrams were simple co‐saturation type, each having an invariant point, two univariant curves and two crystallization regions. The equilibrium solid phases in the ternary system KBr–K2B4O7–H2O are potassium bromide (KBr) and potassium tetraborate tetrahydrate (K2B4O7·4H2O), and those in the ternary system KCl–K2B4O7–H2O are potassium chloride (KCl) and potassium tetraborate tetrahydrate (K2B4O7·4H2O). Comparisons of the phase diagrams of the two systems at different temperatures show that there is no change in the crystallization phases, but there are changes in the size of the crystallization regions. As temperature increases, the solubility of K2B4O7·4H2O increases rapidly, so the crystallization field of K2B4O7·4H2O becomes smaller. |
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| Keywords: | Underground brine phase equilibrium solubility potassium salt borate |
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