273.15K下Na+,K+//Cl-,SO42-,NO3-H2O五元体系的相平衡研究

引用本文: 廖玲, 黄雪莉. 273.15K下Na⁺,K⁺//Cl^-,SO₄^2-,NO₃^-H₂O五元体系的相平衡研究[J]. 化学通报, 2016, 79(1): 62-65,61. shu

Citation: Liao Ling, Huang Xueli. Liquid-Solid Phase Equilibria in the Quinary System ofNa⁺, K⁺//Cl^-, SO₄^2-, NO₃^--H₂O at 273.15 K[J]. Chemistry, 2016, 79(1): 62-65,61. shu

273.15K下Na⁺,K⁺//Cl^-,SO₄^2-,NO₃^-H₂O五元体系的相平衡研究

廖玲 ,
黄雪莉 ^,

1.
新疆煤炭洁净转化与化工过程重点实验室新疆大学化学化工学院乌鲁木齐 830046

通讯作者: 黄雪莉,女,博士,教授。E-mail:xuelih@163.com

基金项目:
国家自然科学基金项目（21166022)

新疆大学创新团队（培育）项目资助

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^-，SO₄^2-，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2个零变量点、5条单变量溶解度曲线、4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2个零变量点、5条单变量溶解度曲线、4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。

关键词:

硝酸盐
/ 水盐体系
/ 低温
/ 相平衡
/ 复盐

English

Liquid-Solid Phase Equilibria in the Quinary System ofNa⁺, K⁺//Cl^-, SO₄^2-, NO₃^--H₂O at 273.15 K

Liao Ling ,
Huang Xueli ^,

1.
Key Laboratory of Xinjiang Coal Clean Conversion and Chemical Process, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046

Corresponding author: 黄雪莉,女,博士,教授。E-mail:xuelih@163.com

Received Date: 24 April 2015
Fund Project:
国家自然科学基金项目（21166022)

新疆大学创新团队（培育）项目资助

Abstract: Xinjiang is rich in saline lake resources and has a long cold winter, some researches showed that brine can be separated by using cold energy in winter. The liquid-solid phase equilibriums of Na⁺, K⁺//Cl^-, SO₄^2-, NO₃^--H₂O and Na⁺, K⁺//Cl^-, NO₃^--H₂O systems were investigated by isothermal method at 273.15K. Based on the data of literatures and experiments, solubilities and densities of the two systems were received and the phase diagrams were plotted. The results showed that the phase diagram of the system Na⁺, K⁺//Cl^-, NO₃^--H₂O consists of two invariant points, five invariant curves and four crystallization regions corresponding to NaNO₃, NaCl, KNO₃ and KCl respectively. In addition, compared with the phase diagram of this quaternary system at 298.15K, the crystalline region of KNO₃ becomes larger. For the system Na⁺, K⁺//Cl^-, SO₄^2-, NO₃^--H₂O saturated with NaCl, the phase diagram consists of two invariant points, five invariant curves, four crystallization regions corresponding to NaCl+Na₂SO₄·10H₂O, NaCl+NaNO₃, NaCl+KNO₃, and NaCl+KCl respectively. Compared with the phase diagram of this system at 298.15K, it was more simple, in which the crystalline regions of double salts, glaserite and darapskite, disappear, and the Na₂SO₄·10H₂O crystalline region becomes larger.

Key words:

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273.15K下Na⁺,K⁺//Cl^-,SO₄^2-,NO₃^-H₂O五元体系的相平衡研究

通讯作者: 黄雪莉,女,博士,教授。E-mail:xuelih@163.com

English

Liquid-Solid Phase Equilibria in the Quinary System ofNa⁺, K⁺//Cl^-, SO₄^2-, NO₃^--H₂O at 273.15 K

Corresponding author: 黄雪莉,女,博士,教授。E-mail:xuelih@163.com

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