Abstract
The major marine resources are electrolytes, and they are mainly dissolved as ions. More than 70 wt% of electrolytes are sodium chloride, but other electrolytes are also dissolved in seawater. To develop a separation or recovery of electrolytes in seawater, we discussed the electrolyte solution model applied to several electrolytes in seawater. The electrolyte NRTL (Non-Random Two Liquid model) for activity coefficient can be applied to multicomponent systems. Twelve solubility data of two-component systems (water + one electrolyte) are correlated by the solubility product function with the electrolyte NRTL model, and we determined the parameters of solubility products. Some solubility data of three-component systems (water + two electrolytes) were compared to the predicted solubility by electrolyte NRTL model.
