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# Solid–Liquid Equilibria in the Quinary System
Na^{+}, K^{+}//Cl^{–}, Br^{–}, SO_{4}^{2–}–H_{2}O at 323.15
and 348.15 K

journal contribution

posted on 2023-10-19, 20:40 authored by Yulong Zhang, Yun Li, Hongfei Guo, Xiuwu Liu, Dong Xu, Jilin CaoAiming at the comprehensive utilization
of bromine resources in
bittern, the stable solid–liquid equilibria in the quinary
system Na

^{+}, K^{+}//Cl^{–}, Br^{–}, SO_{4}^{2–}–H_{2}O at 323.15 and 348.15 K were studied using the isothermal dissolution equilibrium method. The corresponding phase equilibrium data were measured, and with which the simplified equilibrium dry-salt phase diagrams saturated with Na_{2}SO_{4}and K_{2}SO_{4}, respectively, Na^{+}content diagrams and K^{+}content diagrams were plotted. As a result, the quinary system saturated with Na_{2}SO_{4}at both two temperatures contains an invariant point, three univariant curves, and three crystallization regions including the single-salt KBr, the double-salt Na_{2}SO_{4}·3K_{2}SO_{4}, and the solid solution Na(Cl, Br). The crystallization areas of Na_{2}SO_{4}·3K_{2}SO_{4}, Na(Cl, Br), and KBr decrease in sequence. By comparison, the phase diagrams of the quinary system saturated with K_{2}SO_{4}at both 323.15 and 348.15 K are much simpler and have no invariant points, instead of one univariant curve and two crystallization regions (Na_{2}SO_{4}·3K_{2}SO_{4}and K(Cl, Br)). The crystallization area of Na_{2}SO_{4}·3K_{2}SO_{4}is essentially as large as that of K(Cl, Br).## History

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two temperatures containsthree univariant curvessup >+simplified equilibrium dryquinary system saturatedone univariant curvetwo crystallization regions4 2 k ( clquinary system na15 k aimingcrystallization areascrystallization area15 kstudied usingsalt nasalt kbrphase diagramsmuch simplerkbr decreaseinvariant pointsinvariant pointcontent diagramscomprehensive utilizationbromine resourcesbr ).br ),br )).

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