| 廖玲,黄雪莉.化学通报,2016,79(1):62-65,61. |
| 273.15K下Na , K //Cl-, SO42-, NO3--H2O五元体系的相平衡研究 |
| Liquid-solid Phase Equilibria in the Quinary System ofNa＋, K＋//Cl－, SO42－, NO3－－H2O at 273.15 K |
| 投稿时间：2015-04-24 修订日期：2015-07-29 |
| DOI： |
| 中文关键词: 硝酸盐 水盐体系 低温 相平衡 复盐 |
| 英文关键词:Nitrate Salt-water system Low temperature Phase equilibrium Double salts |
| 基金项目:新疆含钾及含硝酸盐卤水体系低温相关系及热力学研究 |
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| 中文摘要: |
| 新疆盐湖资源丰富,冬季寒冷漫长,已有研究表明利用冬季冷能可以实现卤水浓淡分离。本文采用等温溶解平衡法针对新疆含硝酸盐卤水开发过程中涉及的Na+, K+ //Cl-, SO42-, NO3--H2O及Na+, K+//Cl-, NO3--H2O体系 273.15K下的相平衡关系进行了研究。通过查找文献及实验获得两个体系各盐的溶解度及溶液密度,并绘制相图。研究表明: 上述四元体系的干盐相图有两个零变量点、五条单变量溶解度曲线、四个单盐结晶区分别对应于NaNO3、NaCl、KNO3和KCl; 与该体系在298.15K下的相图相比, 硝酸钾结晶区扩大很多；上述五元体系干盐相图(NaCl饱和)有两个零变量点、五条单变量溶解度曲线、四个两盐结晶区分别对应于NaCl+NaNO3, NaCl+Na2SO4?10H2O, NaCl+KNO3, NaCl+KCl; 与该体系298.15K下的相图相比, 复盐钾芒硝和钠硝矾结晶区消失,芒硝结晶区扩大,相图大为简化. |
| 英文摘要: |
| XinjiangSis rich in saline lake resources and has a long cold winter , some researches show that brine can be separated by using cold energy in winter. The liquid-solid phase equilibria of Na＋, K＋//Cl－, SO42－, NO3－－H2O and Na＋, K＋//Cl－, NO3－－H2O systems were investigated by isothermal method at 273.15K. Through the literature and experiments, solubilities and densities of the two system were received. Using those data, the phase diagrams were plotted. The results show that the phase diagram of the system Na＋, K＋//Cl－, NO3－－H2O consists of two invariant points, five univariant curves and four crystallization regions corresponding to NaNO3, NaCl, KNO3 and KCl. In addition, compared with the phase diagram of the quaternary system at 298.15K, the crystalline region of KNO3 becomes larger. For the system Na＋, K＋//Cl－, SO42－, NO3－－H2O saturated with NaCl, the phase diagram consists of two invariant points, five univariant curves, four crystallization regions corresponding to NaCl Na2SO4?10H2O, NaCl NaNO3, NaCl KNO3, and NaCl KCl. Compared with the phase diagram of the quinary system at 298.15K, the crystalline regions of double salts, glaseriteand darapskite disappear, and the Na2SO4?10H2O crystalline region of becomes larger. As a result, the phase diagram is simplified greatly at 273.15K. |
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