Composite membrane for gas separation

Abstract

Abstract PURPOSE:To obtain a composite membrane having a large coefft. of separation by coating a coating material which per se does not form any film on the extra thin films which are used for separation of oxygen or the like and are supported on a porous substrate. CONSTITUTION:The composite membrane is formed by forming an extra thin film having gas permselectivity on a substrate consisting of a porous material. A coating material is dissolved in a suitable solvent and is coated on this composite membrane. For example, a composite membrane for obtaining oxygen rich gas from air is obtained by spraying the soln. prepd. by dissolving 10pts.wt. polydimethyl siloxane in 90pts.wt. tertiary butanol on the surfaces of two sheets of extra thin films of poly- 4-methyl pentene-1 carried on a polyolefin type porous substrate at a 40 deg.C soln. temp. by using gaseous nitrogen of 1.0 gage atmospheric pressure.

Inventors

• 👤 Toshiyuki Hiramatsu
• 👤 Gen Kurisu
• 👤 Kenko Yamada
• 👤 Teizo Yamaji

Bibliographic Details