Sea-water solubility phase diagram. Application to an extractive
process*
R. Cohen-Adad 1, Chr. Balarew 2, S. Tepavitcharova
2 , and
D. Rabadjieva 2
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.
* Lectures presented at the 10th International Symposium
on Solubility Phenomena, Varna, Bulgaria, 22 -26 July 2002. Other
lectures are published in this issue, pp. 1785-1920.
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