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

Cohen-Adad, R.; Balarew, Chr.; Tepavitcharova, S.; Rabadjieva, D.

doi:10.1351/pac200274101811

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

http://dx.doi.org/10.1351/pac200274101811

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⁻, SO₄^2-//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.