Premium
Selective ion permeation through fluorocarbon polymer membrane
Author(s) -
Igawa Manabu,
Torii Katsumi,
Tanaka Masao,
Senō Manabu
Publication year - 1984
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1984.070290112
Subject(s) - membrane , permeation , fluorocarbon , polymer , ion , semipermeable membrane , chemical engineering , diffusion , chemistry , synthetic membrane , permeability (electromagnetism) , polymer chemistry , materials science , organic chemistry , biochemistry , physics , engineering , thermodynamics
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/dm 3 and 40 kg/cm 2 . 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.