Process to produce high pressure nitrogen using a high...

F - Mech Eng,Light,Heat,Weapons – 25 – J

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F25J 3/04 (2006.01)

Patent

CA 2216336

A process is set forth for the cryogenic distillation of an air feed to produce high pressure nitrogen of various purity, varying from moderately high purity (99.9% nitrogen) to ultra-high purity (less than 1 part per billion of oxygen). The process is particularly suited for cases where the high pressure nitrogen is needed directly from the distillation column system to avoid contamination concerns associated with compressing nitrogen that is produced at lower pressures. The process uses a high pressure column, which operates at a pressure to directly produce the nitrogen at the desired high pressure, and one or more lower pressure columns which produces a portion of the nitrogen product at a lower pressure. At least a portion of the lower pressure nitrogen is compressed and fed to the high pressure column at a location which is below the removal location of the high pressure nitrogen.

Procédé pour la distillation cryogénique d'une alimentation en air pour produire à haute pression de l'azote dont le degré de pureté varie de moyennement élevé (azote à 99.9 %) à ultra-élevé (moins d'une partie par milliard d'oxygène). Le procédé convient particulièrement aux cas où l'azote à haute pression est requis directement du système à colonne de distillation par souci d'éviter la contamination associée à la compression de l'azote qui est produit à des pressions inférieures. Le procédé utilise une colonne à haute pression, qui fonctionne à une pression permettant de produire l'azote directement à la haute pression souhaitée, et une ou plus d'une colonne à pression plus basse qui produit une partie de l'azote à une pression inférieure. Au moins une partie de l'azote à basse pression est comprimée et acheminée à la colonne haute pression en un point qui se trouve sous le point d'extraction de l'azote à haute pression.

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