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Solid‐Liquid Equilibria in the Quinary Na + , K + //Cl − , SO 2− 4 , B 4 O 2− 7 ‐H 2 O System at 298 K
Author(s) -
Sang Shihua,
Zhang Xiao,
Zeng Xiaoxiao,
Li Dan
Publication year - 2011
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201190238
Subject(s) - quinary , chemistry , phase diagram , crystallization , isothermal process , analytical chemistry (journal) , thermodynamics , phase (matter) , physics , chromatography , organic chemistry , alloy
The solid‐liquid equilibria in the quinary system Na + , K + //Cl − , SO 2− 4 , B 4 O 2− 7 ‐H 2 O at 298 K had been studied experimentally using the method of isothermal solution saturation. Solubilities and densities of the solution of the quinary system were measured experimentally. Based on the experimental data, the dry‐salt phase diagram and water content diagram of the quinary system were constructed, respectively. In the equilibrium diagram of the quinary system Na + , K + //Cl − , SO 2− 4 , B 4 O 2− 7 ‐H 2 O at 298 K, there are five invariant points F1, F2, F3, F4 and F5; eleven univariant curves E1F1, E2F2, E3F3, E4F5, E5F2, E6F4, E7F5, F1F4, F2F4 F1F3 and F3F5, and seven fields of crystallization saturated with Na 2 B 4 O 7 corresponding to Na 2 SO 4 , Na 2 SO 4 ·10H 2 O, Na 2 SO 4 ·3K 2 SO 4 (Gla), K 2 SO 4 , K 2 B 4 O 7 ·4H 2 O, NaCl and KCl. The experimental results show that Na 2 SO 4 ·3K 2 SO 4 (Gla), K 2 SO 4 and K 2 B 4 O 7 ·4H 2 O have bigger crystallization fields than other salts in the quinary system Na + , K + //Cl − , SO 2− 4 , B 4 O 2− 7 ‐H 2 O at 298 K.