Water Activity Measurements by the Isopiestic Method for the MCl-CaCl2-H2O (M = Na, K) Systems at 323.15 K

被引：9
作者：
Han, Haijun [1 ,2 ]
Guo, Lijiang [2 ]
Li, Dongdong [2 ]
Dong, Ouyang [2 ]
Yao, Yan [2 ]
Zhang, Ning [1 ]
Zeng, Dewen [1 ]
机构：
[1] Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China
[2] Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810008, Peoples R China
来源：
JOURNAL OF CHEMICAL AND ENGINEERING DATA | 2015年 / 60卷 / 08期
关键词：
PITZER MODEL REPRESENTATION; ION-INTERACTION MODEL; ACTIVITY-COEFFICIENTS; OSMOTIC COEFFICIENTS; THERMODYNAMIC PROPERTIES; VAPOR-PRESSURES; MIXTURES; MULTICOMPONENT; CHLORIDE;
D O I：
10.1021/acs.jced.5b00155
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
In this work, the water activities of the NaCl-CaCl2-H2O and KCl-CaCl2-H2O ternary systems and of their sub-binary systems NaCl-H2O and KCl-H2O were measured using an isopiestic method at 323.15 K The isopiestic composition line for the NaClCaCl2-H2O system was found to obey the Zdanovskii rule very well, whereas the KCl-CaCl2-H2O system deviated slightly. The addition of NaCl to an aqueous solution of CaCl2 decreased its water activity for all CaCl2 molalities. However, KCl was found to decrease and increase the water activity at low and high CaCl2 molality, respectively. The turning point appears at 8.0 mol.kg(-1) CaCl2 solution. The Pitzer-Simonson-Clegg (PSC) model was applied to represent the water activity of the two ternary systems, and the calculated results are discussed.
引用
收藏
页码：2285 / 2290
页数：6
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