Low-temperature air fractionation process

Details Low-temperature air fractionation process Low-temperature air fractionation process

2006-11-14

2006-11-14

Doerrler, William C. (Department: 3744)

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

C062S903000

Reexamination Certificate

active

07134297

ABSTRACT:
The invention relates to a process for the low-temperature fractionation of air in a rectification unit, which comprises a pressure column (1) a low-pressure column (2) and a condenser-evaporator system having at least two falling-film evaporators (203, 204). Oxygen-rich liquid from the low-pressure column (2) is introduced into the evaporation passages of the first and second falling-film evaporators (203, 204) and is partially evaporated. Unevaporated oxygen-rich liquid from the first falling-film evaporator (203) is transferred into the evaporation passages of the second falling-film evaporator (204).

REFERENCES:
patent: 4606745 (1986-08-01), Fujita
patent: 5122174 (1992-06-01), Sunder et al.
patent: 5699671 (1997-12-01), Lockett et al.
patent: RE36435 (1999-12-01), Grenier et al.
patent: 6351968 (2002-03-01), Habicht et al.
patent: 0 926 457 (1999-06-01), None

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