Air separation schemes for oxygen and nitrogen coproduction...

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

Patent

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F25J 3/04 (2006.01)

Patent

CA 2131655

The present invention is an improvement to a cryogenic distillation process for the separation of air into its constituent components. The present invention process uses a distillation column system which comprises at least two distillation columns wherein the top of the higher pressure column is in thermal communication with the lowerpressure column. The distinctive feature and improvement of the present invention comprise: (a) condensing a portion of the compressed, contaminant-free, feed air by appropriate means, such as against vaporization of liquid oxygen or other source of refrigeration; (b) using at least a portion of this liquid air as impure reflux in one of the distillation columns, and (c) removing a waste vapor stream from a location situated no more than four theoretical stages above the location where the liquid air is fed to the column, such that this waste vapor stream has a nitrogen mole fraction of less than 0.95.

La présente invention vise un perfectionnement à un procédé de distillation cryogénique pour la séparation des constituants de l'air. Le procédé de la présente invention utilise un système de colonnes de distillation qui comprend au moins deux colonnes de distillation, dans lequel le haut de la colonne moyenne pression est en communication thermique avec la colonne basse pression. La caractéristique singulière et le perfectionnement objets de la présente invention se résument ainsi : (a) condensation d'une partie de l'air gazeux d'alimentation comprimé et exempt de polluants par un moyen approprié, comme, par exemple, la vaporisation d'oxygène liquide ou d'un autre agent frigorigène; (b) utilisation d'au moins une partie de cet air liquide en tant que reflux impur dans l'une des colonnes de distillation; et (c) extraction du gaz résiduaire à un endroit situé à au plus quatre étages théoriques au-dessus de l'endroit où l'air liquide est introduit dans la colonne, de façon que la fraction molaire de l'azote présent dans ce gaz résiduaire est inférieure à 0,95.

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