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Solubility of (NH4)Al(S04)2 .12H20 in the Systems H20—(NH4)Al(S04)2—H2S04 and H20—(NH4)Al(S04)2—H3P04 at the Temperatures of 20 °C and 30 °C and Vapour Pressure above these Systems

A. Žúžiova, Van Viet, V. Khandl, and P. Fellner

Department of Inorganic Technology, Faculty of Chemical Technology, Slovak Technical University, SK-812 31 Bratislava


Abstract: Influence of concentration of H2SO4 and H3PO4 On the solubility of (NH4)Al(SO4)2 . 12H2O in aqueous solutions and vapour pressure above saturated solutions of the systems H2O-(NH4)Al(SO4)2-H2SO4 and H2O-(NH4)Al(SO4)2-H3PO4 was investigated. The measurements were carried out at the temperatures of 20°C and 30°C. It is shown that in the system H2O-(NH4)Al(SO4)2-H2SO4 solubility of (NH4)Al(SO4)2 . 12H2O increases with increasing concentration of H2SO4 up to 8 mass % H2SO4. When concentration of the acid further increases, solubility of (NH4)Al(SO4)2 . 12H2O decreases. However, from the concentration of ca. 35 mass % H2SO4 it starts to increase again. At high concentrations of sulfuric acid (> 30 mass %) it is Al2(SO4)3 . 16H2O and not(NH4)Al(SO4)2. 12H2O which is in equilibrium with the solution. Water vapour pressure above the solutions shows how the activity of water changes with composition of the investigated systems.

Full paper in Portable Document Format: 494a173.pdf


Chemical Papers 49 (4) 173–175 (1995)

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