초록 ▼

An ultrathin, high-flux composite membrane for use in gas separation. The membrane comprises a metal layer, typically 500Åor less thick on a microporous support. The support may be as asymmetric Loeb-Sourirajan type membrane or a two-layer composite of a microporous substrate with a very thin sealin

An ultrathin, high-flux composite membrane for use in gas separation. The membrane comprises a metal layer, typically 500Åor less thick on a microporous support. The support may be as asymmetric Loeb-Sourirajan type membrane or a two-layer composite of a microporous substrate with a very thin sealing layer. The support gives mechanical strength to the membrane but does not contribute significantly to the selectivity. Optionally the metal layer may be overcoated with a second polymeric sealing layer to plug any defects and to protect the fragile surface from mechanical damage. The membrane is particularly useful in the purfication of hydrogen.

대표청구항 ▼

A gas separation membrane for separating a preferentially permeating component and a non-preferentially permeating component from a gas mixture, comprising a polymeric substrate layer and an ultrathin metal layer coating said substrate layer, said substrate layer exhibiting a flux of said preferenti

A gas separation membrane for separating a preferentially permeating component and a non-preferentially permeating component from a gas mixture, comprising a polymeric substrate layer and an ultrathin metal layer coating said substrate layer, said substrate layer exhibiting a flux of said preferentially permeating component of at least 1×10-4 cm3(STP)/cm2ㆍsㆍcmHg, and said gas separation membrane exhibiting a flux of said preferentially permeating component of at least 1×10-5 cm3(STP)/cm2ㆍsㆍcmHg and wherein the selectivity for said preferentially permeating component over said non-preferentially permeating component is greater than the selectivity of said substrate layer for said components. A method for preparing a gas separation membrane, for separating a preferentially permeating component and a non-preferentially permeating component from a gas mixture, comprising: providing a polymeric substrate layer, coated with a first sealing layer and exhibiting a flux of said preferentially permeating component of at least 1×10-4cm3(STP)/cm2ㆍsㆍcmHg; depositing on said substrate layer an ultrathin metal layer; and overcoating said metal layer with a second sealing layer; wherein the resultant gas separation membrane exhibits a flux of said preferentially permeating component of at least 1×10-5 cm3(STP)/cm2ㆍsㆍcmHg and wherein the selectivity for said preferentially permeating component over said non-preferentially permeating component is greater than the selectivity of said substrate layer for said components.