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Pure Appl. Chem., 2002, Vol. 74, No. 10, pp. 1811-1821

Sea-water solubility phase diagram. Application to an extractive process

R. Cohen-Adad1, Chr. Balarew2, S. Tepavitcharova2 and D. Rabadjieva2

1 Université Claude Bernard Lyon I, 43 Boulevard du 11 Novembre 1918, 69622, Villeurbanne Cedex, France
2 Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. G. Bontchev Str., Bl.11, 1113 Sofia, Bulgaria

Abstract: The main goal of this presentation is to tentatively forecast or improve an extractive process. The sea-water system is described using a graphical representation of the quinary ion-pair system Na+, K+, Mg2+/Cl, SO42-//H2O. The operations required by extraction or purification of a sea-water component are simulated by a path through the solubility diagram.The procedure is applied to isothermal evaporation of Black Sea water at 25 °C, and the balance of the crystallization sequence is determined. In the same way, the cooling of residual brine, after precipitation of pure sodium chloride, is studied.