Selective permeable membrane

Abstract

Abstract PURPOSE:To attain to enhance the chemical resistance, the heat resistance and the pressure resistance of a selective permeable membrane, in solution separation due to a reverse osmosis method, by using a methylolated polyhydroxystyrene oxide crosslinked membrane. CONSTITUTION:A selective permeable membrane formed from crosslinked methylolated polyhydroxystyrene oxide has a zore size of 10-300Angstrom and excellent in chemical resistance, heat resistance, pressure resistance and film forming property as a reverse osmosis membrane. The M.W. of the polymer is pref. 300-several ten thousands and crosslinking is pref. carried out in the presence of a catalyst. The formation of the membrane is pref. carried out by a method wherein methylolated polyhydroxystyrene oxide is dissolved in a solvent and the resulting solution is cast into a film on a porous support and, as the porous support, one with a pore size of 5,000Angstrom or less comprising a polysulfone resin is preferred.

Inventors

• 👤 Hiroshi Kawahara
• 👤 川原　宏
• 👤 Tetsuro Yasuda
• 👤 安田　哲朗
• 👤 Iwahiro Otsuka
• 👤 大塚　厳弘

Bibliographic Details