Abstract
Desalination membranes of 6-Nylon were prepared by casting method. The Nylon solution was spread thinly on a glass plate, and the solvent was evaporated at a constant temperature. The film cast was immersed in water and then cured. The casting solution was composed of 6-Nylon (30-35%), formic acid (35-45%), and m-cresol or o-chlorophenol (20-30%). Membranes of better performance were obtained when the evaporation of the solvent was done at a high temperature (100°C) for a short period (3-4 min). Various curing processes were examined, but the curing in steam was found most effective. The rejection of the membrane which had been evaporated for 5 minutes at 100°C and cured in steam, showed 78% for Na+ ion (Raw solution: 0.05 mol/liter NaCl, Operating pressure: 50kg/cm2), but the amount of the flux was not very large.
