초록 ▼

A composite membrane having molecular sieve activity and/or catalytic activity composed of a porous support of a metal, an inorganic material or a polymeric material and combined with its one surface, an ultrathin film of a cage-shaped zeolite composed of a 6-, 8- 10- or 12-membered oxygen ring wind

A composite membrane having molecular sieve activity and/or catalytic activity composed of a porous support of a metal, an inorganic material or a polymeric material and combined with its one surface, an ultrathin film of a cage-shaped zeolite composed of a 6-, 8- 10- or 12-membered oxygen ring window having aluminum or gallium atoms, silicon or germanium atoms, and oxygen atoms as constituent members. The composite membrane can be produced, for example, by the various processes described and claimed herein.

대표청구항 ▼

A permeable composite membrane, comprising: a porous support; and an ultrathin film of a cage-shaped non-granular zeolite composed of a 6-, 8-, 10-, or 12-membered oxygen ring window having aluminum or gallium atoms, silicon or germanium atoms, and oxygen atoms as constituent members, said ultrathin

A permeable composite membrane, comprising: a porous support; and an ultrathin film of a cage-shaped non-granular zeolite composed of a 6-, 8-, 10-, or 12-membered oxygen ring window having aluminum or gallium atoms, silicon or germanium atoms, and oxygen atoms as constituent members, said ultrathin film of non-granular zeolite being a continuous surface layer on said porous support whereby said permeable composite membrane is adapted to selectively separate materials passing through said permeable composite membrane utilizing molecular sieve separation action and/or catalysis and whereby said separation is performed by a continuous non-phase change process. A process for producing a permeable composite membrane, comprising: (a) mixing an aluminate or gallate and a silicate or germanate in the form of an alkali metal salt, an alkaline earth metal salt, an ammonium salt or a lower alkyl-substituted ammonium salt with an aqueous solution of a hydroxide of an alkali metal, an alkaline earth metal, ammonium or an alkyl-substituted ammonium to form a gel, (b) passing the formed gel through a micro filter having a size of at least approximately 0.2 micron, (c) depositing uniformly the filtered gel on one smooth surface of a porous support or a dense support capable of being rendered porous by a chemical after-treatment to form a surface gel layer, (d) hydrothermally treating the formed surface gel layer at a temperature of at least 30°C. to crystallize the gel thereby forming an ultrathin film of cage-shaped non-granular zeolite being a continuous surface layer on said support, (e) if required, reducing the content of the alkali metal, alkaline earth metal, ammonium or alkyl-substituted ammonium in the crystallized gel to not more than 1% by an ion exchange treatment, (f) when the support is dense, chemically treating it to render it porous, and (g) washing and drying the resulting permeable composite membrane.