Process and apparatus for the separation of air by cryogenic...

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

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F25J 3/04 (2006.01)

Patent

CA 2695817

A process for the production of at least one liquid product (53, 71) and at least one gaseous product (55, 61) by cryogenic distillation is disclosed , according to the first mode, at least part of the feed air is removed from an intermediate point of the heat exchange line (19) , compressed at a cryogenic temperature in a cold compressor (37) and sent to the heat exchange line (19) to be further cooled and sent to the column system (65, 67) and part of the feed air is sent to a first expander (39) and according to the second mode, all of the feed air is compressed to a high pressure at least 20 bars higher than the highest column pressure of the column system (65, 67) in a second compressor (11, 17) , cooled in the heat exchange line (19) and sent in part to a column system (65, 67), another part of the high pressure air being sent to the second expander (29).

La présente invention concerne un processus de production d'au moins un produit liquide (53, 71) et d'au moins un produit gazeux (55, 61) par distillation cryogénique. Selon le premier mode, au moins une partie de l'air d'alimentation est retirée d'un point intermédiaire de la conduite d'échange de chaleur (19), comprimée à une température cryogénique dans un compresseur frigorifique (37) et envoyée à la conduite d'échange de chaleur (19) pour continuer d'être refroidie puis envoyée au système de colonne (65, 67), et une partie de l'air d'alimentation est envoyée à un premier détendeur (39). Selon le second mode, l'ensemble de l'air d'alimentation est comprimé à une haute pression supérieure d'au moins 20 barres à la pression de colonne la plus élevée du système de colonne (65, 67) dans un second compresseur (11, 17), refroidi dans la conduite d'échange de chaleur (19) et envoyé en partie à un système de colonne (65, 67), une autre partie de l'air haute pression étant envoyée au second détendeur (29).

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