Solid–Liquid Stable Equilibrium of the Aqueous Quaternary System NH4SCN–(NH4)2S2O3–(NH4)2SO4–H2O at 303.15 K
Solid–Liquid Stable Equilibrium of the Aqueous Quaternary System NH4SCN–(NH4)2S2O3–(NH4)2SO4–H2O at 303.15 K
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DOI：
10.1021/je500738g
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发表时间：
2015-01
影响因子：
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通讯作者：
Dongchan Li;Fei Li;Yingying Zhao;Junsheng Yuan
中科院分区：
文献类型：
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作者：
Dongchan Li;Fei Li;Yingying Zhao;Junsheng Yuan
硫氰酸盐、硫代硫酸盐和硫酸盐存在于各种工业过程中，如纺织、焦化和电镀。这些工业排放的污水对环境污染严重，不能直接排放。此外，还有机会从这些流出物中回收显著的商业价值。相平衡和相图在分离和回收有用资源方面起着重要作用。本文用等温溶解平衡法测定了303.15 K时NH_4SCN-(NH_4)_2S_2O_3-(NH_4)_2SO_4-H_2O体系及其各子系统的相图。在四元系相图中，有一个不变点、三条单变曲线和三个结晶区。不变点用硫氰酸铵、硫酸铵和硫代硫酸铵(NH4SCN+(NH4)2SO4+(NH4)2S2O)共饱和。这三个结晶区分别对应于硫酸铵((NH4)2SO4)、硫氰酸铵(NH4SCN)和AMM。
The salts of thiocyanate, thiosulfate, and sulfate exist in a variety of industrial processes such as textile, coking, and electroplating. The effluents from these industries cannot be discharged directly owing to their severe environmental pollution. In addition, there is an opportunity to recover significant commercial value from these effluents. The phase equilibria and phase diagram play a major role in separating and recovering useful resources. In this paper, the phase diagrams of the system NH4SCN–(NH4)2S2O3–(NH4)2SO4–H2O and its subsystems at 303.15 K were determined by an isothermal dissolution equilibrium method. In the phase diagram of the quaternary system, there is one invariant point, three univariant curves and three crystallized regions. The invariant point is cosaturated with ammonium thiocyanate, ammonium sulfate, and ammonium thiosulfate (NH4SCN + (NH4)2SO4 + (NH4)2S2O3). The three crystallization regions correspond to ammonium sulfate ((NH4)2SO4), ammonium thiocyanate (NH4SCN), and amm...