Air separation method and apparatus to produce an oxygen product

Details Air separation method and apparatus to produce an oxygen product Air separation method and apparatus to produce an oxygen product

1999-01-29

2000-07-04

Capossela, Ronald

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62654, 62913, F25J 100

Patent

active

060821353

ABSTRACT:
A method and apparatus for separating out is used to produce an oxygen product in which an air stream after having been compressed and purified is introduced into a bottom reblower located in a bottom region of the distillation column to produce boil up in such distillation column. The resultant air stream liquefies to produce a liquid air stream. The liquid air stream after having been valve expanded is stripped within the distillation column to produce a column bottoms which can be extracted as a product stream that is vaporized within a main heat exchanger. Product stream can be pressurized by being pumped to atmospheric a pressure hence liquefying a further compressed air stream to produce further liquid air is also stripped within the distillation column. The distillation column operates at near atmospheric pressures that is pressures between 1 and 1.3 bar absolute. Refrigeration is introduced into the plant by injecting liquid preferably liquid oxygen into a bottom region of the distillation column.

REFERENCES:
patent: 4732595 (1988-03-01), Yoshino
patent: 5084081 (1992-01-01), Rohde
patent: 5505052 (1996-04-01), Ekins et al.
patent: 5596885 (1997-01-01), Grenier

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