Gas separation membranes containing a microporous silica...

B - Operations – Transporting – 01 – D

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B01D 71/02 (2006.01) B01D 53/22 (2006.01)

Patent

CA 2634204

The subject of the present invention is a method for producing a gas separation membrane, comprising the deposition of a film from a silica sol onto a porous support followed by heat treatment of the film thus deposited, in which the silica sol deposited is prepared by hydrolysing a silicon alkoxide in the presence of a doping amount of a precursor of an oxide of a trivalent element, especially boron or aluminium. The invention also relates to the membranes as obtained by this method, and also to their uses, especially for the separation of helium or hydrogen at high temperature, and in particular for removing impurities in helium streams.

La présente invention a pour objet un procédé de préparation d'une membrane de séparation de gaz, comprenant le dépôt d'un film à partir d'un sol de silice sur un support poreux, puis le traitement thermique du film ainsi déposé, où le sol de silice déposé est préparé en hydrolysant un alcoxyde de silicium en présence d'une quantité dopante d'un précurseur d'un oxyde d'un élément trivalent, notamment le bore ou l'aluminium. L'invention concerne également les membranes telles qu'obtenues selon ce procédé, ainsi que leurs utilisations, notamment pour la séparation d'hélium ou d'hydrogène à température élevée, et en particulier pour l'élimination d'impuretés dans des flux d'hélium.

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