Method of recovering oxygen-rich gas

Details Method of recovering oxygen-rich gas Method of recovering oxygen-rich gas

C - Chemistry, Metallurgy

01

B

C01B 13/02 (2006.01) B01D 53/047 (2006.01)

Patent

CA 2189232

A method of recovering an oxygen-rich gas from a gaseous mixture mainly comprising nitrogen and oxygen by pressure swing adsorption using two adsorption towers (A and B) packed with adsorbents adsorbing selectively nitrogen, wherein the recovery of the oxygen-rich gas remaining as the result of pressure equalization between the two towers is conducted exhaustively and nitrogen is continuously withdrawn by suction by connecting a vacuum pump to either tower (A) or tower (B) without interruption. To that end, the pressure equalization between the two towers (A and B) is conducted in at least two steps in such a manner that one tower (A or B) is increased in pressure, while the other tower (B or A) is decreased in pressure, so that the oxygen-rich gas can be recovered till the pressure difference between the two towers (A and B) decreases to almost zero.

Procédé de récupération d'un gaz riche en oxygène dans un mélange gazeux comprenant principalement de l'azote et de l'oxygène, par adsorption modulée en pression au moyen de deux colonnes (A et B) garnies d'adsorbants adsorbant sélectivement l'azote. La récupération du gaz riche en oxygène restant comme suite à l'équilibrage de pression entre les deux colonnes s'effectue de manière exhaustive, l'azote étant aspiré en continu par une pompe à vide (8) branchée sur la colonne (A) ou (B). Pour ce faire, l'équilibrage de pression entre les deux colonnes (A et B) s'effectue en au moins deux phases de sorte que la pression dans une colonne (A ou B) soit augmentée alors que celle dans l'autre colonne (A ou B) soit réduite et que le gaz riche en oxygène puisse être récupéré jusqu'à ce que la différence de pression entre les deux colonnes (A et B) devienne pratiquement nulle.

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