A three column cryogenic cycle for the production of impure...

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

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F25J 3/04 (2006.01)

Patent

CA 2218630

A cryogenic process for producing impure oxygen and/or substantially pure nitrogen utilizes a classic double column arrangement and an additional third column operating at a medium pressure, i.e. between the pressure of the higher pressure stage and the lower pressure stage of the double column system. A portion of the feed air is separated in the stages of the double column system, and another portion of the feed air is distilled in the medium pressure stage. Crude liquid oxygen from the higher pressure stage and/or the medium pressure stage is reduced in pressure and boiled in a reboiler/condenser at the top of the medium pressure column. The vaporized crudeliquid oxygen from the top reboiler/condenser of the medium pressure column is subsequently introduced as a vapor feed to the lower pressure stage, which reduces irreversibilities of separation in the lower pressure stage.

Méthode cryogénique pour l'obtention d'oxygène impur et (ou) d'azote relativement pur, utilisant une colonne double classique et une troisième colonne supplémentaire fonctionnant à pression moyenne, c.-à-d. entre la pression de l'étage à la pression supérieure et celle de l'étage à la pression inférieure du système à colonne double. Une partie de l'alimentation en air est séparée dans les étages du système à colonne double, et une autre partie de cette alimentation est distillée dans l'étage à pression moyenne. La pression de l'oxygène liquide brut provenant de l'étage à la pression supérieure et (ou) de l'étage à la pression moyenne est réduite, et cet oxygène est bouilli dans un rebouilleur/condenseur au sommet de la colonne sous pression moyenne. L'oxygène liquide brut vaporisé provenant du sommet du rebouilleur/condenseur de la colonne sous pression moyenne est ultérieurement introduit comme alimentation en vapeur dans l'étage à la pression inférieure, ce qui réduit les irréversibilités de séparation dans l'étage à la pression inférieure.

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