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Solid–liquid Equilibria in the Quaternary System Na+, Mg2+//Cl–, SO2–4–H2O at 25 and 30°C

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Abstract

The isoplethic sections in the diagram of the quaternary system Na+ , Mg2+ //Cl– , SO2– 4 –H2 O were established at 25 and 30oC by analytical and conductometric measurements. Three compounds can be observed in the isoplethic sections: NaCl, Na2 SO4 and MgNa2 (SO4 )2 4 H2 O. Seven fields are determined, relating to the precipitation of one, two or three salts. The solubility range of MgNa2 (SO4 )2 4 H2 O is wide, while the liquidus curve of Na2 SO4 is very short. The compositions, expressed in Jänecke coordinates, at the eutonic and peritonic points, respectively, were:

42.70% Cl– and 745% H2 O; 79.47% Cl– and 787% H2 O; 71.6% Cl– and 744% H2 O at 25°C; and 48.80% Cl– and 715% H2 O; 80.20% Cl– and 778% H2 O; 70.14% Cl– and 707% H2 O at 30°C.

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  1. Laboratoire de Génie des Procédés, Institut National de Recherche Scientifique et Technique, B.P. 95, Hammam-Lif, 2050, Tunisia

    L. Zayani & R. Rokbani

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  1. L. Zayani
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  2. R. Rokbani
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Zayani, L., Rokbani, R. Solid–liquid Equilibria in the Quaternary System Na+, Mg2+//Cl–, SO2–4–H2O at 25 and 30°C. Journal of Thermal Analysis and Calorimetry 59, 885–892 (2000). https://doi.org/10.1023/A:1010126409399

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