Phase equilibria of a Na+,K+//Cl-,SO42-,NO3--H2O quinary system at 258.15 K

被引：0

作者：

Liao L. ^{[1
]}

Huang X.-L. ^{[1
]}

Song H. ^{[1
]}

机构：

[1] Key Laboratory of Oil & Gas Fine Chemicals, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi

来源：

Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | 2016年 / 30卷 / 01期

关键词：

Nitrate; Phase equilibrium; Quaternary salt-water system; Quinary salt-water system; Solubility;

D O I：

10.3969/j.issn.1003-9015.2016.01.002

中图分类号：

学科分类号：

摘要：

The phase equilibria of a quinary system Na+,K+//Cl-,SO42-,NO3--H2O and one of its subsystems (a quaternary system Na+, K+//Cl-, NO3--H2O) were investigated by an isothermal method at 258.15 K. Solubilities and densities of the quinary system and its quaternary subsystem (except ice phase zone) were determined experimentally, and the equilibrium phase diagrams were plotted. The results show that the phase diagram of the system Na+,K+//Cl-,SO42-,NO3--H2O saturated with NaCl consists of five univariant curves, two invariant points and four crystallization regions corresponding to NaCl-2H2O+NaNO3, NaCl-2H2O+KNO3, NaCl-2H2O+KCl and NaCl-2H2O+Na2SO4-10H2O. Compared with the phase diagram of the quinary system at 298.15 K, the crystalline regions of the double salts (K3Na(SO4)2 and NaNO3-Na2SO4-H2O) disappeared, and the crystalline region of Na2SO4-10H2O became larger. Therefore, the phase diagram of the quinary system was greatly simplified at 258.15 K. For the Na+,K+//Cl-,NO3--H2O system, the phase diagram consisted of five univariant curves, two invariant points and four crystallization regions (except ice phase zone) corresponding to NaNO3, NaCl-2H2O, KNO3 and KCl. In addition, compared with the phase diagram of the quaternary system at 298.15 K, the crystalline region of KNO3 became larger. © 2016, Zhejiang University. All right reserved.

引用

页码：7 / 12

页数：5

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