Abstract
Through a series of our experiments on the desalination of sea water by ion-exchange membrane method at a constant current density, we found it possible to obtain desalinated water of considerably low concentration.
Our experiments showed that Na+, Mg2+, and Ca2+ were eliminated at an almost similar ratio, but the permselectivities of Mg2+ and Ca2+ against Na+ increased as the current density decreased.
On the other hand, the elimination of SO42- was remarkably lower than that of Cl-, and the molar fraction of SO42- in desalinated water increased with the progress of desalination. The permselectivity coefficient of SO42- against Cl- increased as the concentration of Cl- decreased, but the influence of current density of this coefficient was very small.
