Abstract
Hydrophobic polymers have rarely been used for membrane materials, but ions permeated selectively through a very thin hydrophobic membrane under a pressure gradient. The membrane was prepared by coating fluorocarbon polymer on a Teflon membrane filter. The permeabilities of strongly hydrated hydrophilic ions and hydrophobic ions are high through the membrane, but those of weakly hydrated ions are low. The selectivities were enlarged in the mixed salts solution of a low concentration at a high pressure. For example, the permeability of KCl was 0.077 and that of LiCl was 0.80 at 1 × 10−4 mol/dm3 and 40 kg/cm2. The coupling between volume flux and ion flux was high for strongly hydrated ions, while the diffusion flux derived by a concentration gradient was high for weakly hydrated ions.
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