Low temperature air separation process for producing...

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

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F25J 3/04 (2006.01)

Patent

CA 2573429

A compressed air stream (1) is cooled in an exchanger (65) to form a compressed cooled air stream (5). The stream is then cryogenically compressed in a first compressor (50) to form a first pressurized gas stream. The first pressurized gas stream is further cooled in the exchanger, cryogenically compressed in a second compressor, and then it is cooled and partially liquefied. The cooled and partially liquefied product (56) is then fed to a system of distillation columns (80, 81). A liquid product is removed (20) from the system of distillation columns (80, 81). This product is then pressurized (21), vaporized and warmed in the exchanger (65) to yield pressurized gaseous product (22). The system of distillation columns is fed with a liquid feed stream derived from air.

Ecoulement d'air comprimé (1) refroidi dans un échangeur (65) afin d'obtenir un écoulement d'air refroidi comprimé (5). L'écoulement est ensuite comprimé cryogéniquement dans un premier compresseur (50) afin d'obtenir un premier écoulement de gaz sous pression. Ce premier écoulement est ensuite refroidi dans l'échangeur, comprimé cryogéniquement dans un second compresseur, puis refroidi et partiellement liquéfié. Le produit refroidi et partiellement liquéfié (56) est alors acheminé vers un système de colonne de distillation (80, 81). Un produit liquide est supprimé (20) du système (80, 81). Ce produit est alors pressurisé (21), vaporisé et chauffé dans l'échangeur (65) afin d'obtenir un produit gazeux sous pression (22). Le système de colonne de distillation est alimenté en liquide sous forme d'écoulement dérivé de l'air.

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