Semi-permeable composite membrane

Abstract

Abstract PURPOSE:To obtain a semi-permeable composite membrane excellent in separation efficiency and permeability, by reacting dextran and epihalohydrin on a porous support to form a three-dimentional network structure. CONSTITUTION:A porous support having a pore size of 100-1,000Angstrom excellent in heat resistance, chemical resistance and anti-microbial property, such as polysulfone, polystyrene or polypropylene is pref. used. A solution prepared by dissolving polysulfone resin in a polar solvent such as dimethylformamide is cast on a glass plate and the resulting film is immersed in water to prepare the porous support. A dextran crosslinked membrane is prepared by a method wherein an alkaline aqueous solution of dextran is cast on the surface side of the porous support and, after contacted with an epihalohydrin containing org. solvent, heat treatment is effected to carry out the crosslinking reaction to form the dextran crosslinked membrane on the porous support.

Inventors

• 👤 Shinsuke Takegami
• 👤 竹上　信介
• 👤 Tetsuo Ukai
• 👤 鵜飼　哲雄

Bibliographic Details