Very high purity nitrogen by membrane separation

Details Very high purity nitrogen by membrane separation Very high purity nitrogen by membrane separation

C - Chemistry, Metallurgy

01

B

C01B 21/04 (2006.01) B01D 53/22 (2006.01)

Patent

CA 2205364

A semi-permeable gas membrane process is described for the separation of very high purity nitrogen (17) from a process feed gas mixture (11) that is predominantly nitrogen, and one or more other permeable gases, which process comprises providing the feed gas mixture (11) under pressure to a membrane separator unit (14) comprising a semi-permeable separation membrane (16) with respect to which the largest fraction of the other permeable gases is at least 20 times more permeable than nitrogen, to provide a very high purity raffinate nitrogen gas product (17).

Ce procédé met en oeuvre une membrane semi-perméable aux gaz afin d'obtenir de l'azote d'une très grande pureté (17) en le séparant d'un mélange de base gazeux à traiter (11). Ce mélange de base gazeux à traiter (11), composé principalement d'azote et d'autres gaz à forte capacité de pénétration, est compressé contre une unité de séparation par membrane (14) qui comporte une membrane de séparation semi-perméable (16). La majorité des autres gaz ayant une capacité de pénétration au moins 20 fois supérieure à celle de l'azote, on obtient ainsi un produit gazeux d'azote raffiné d'une très grande pureté (17).

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