Air liquefaction separation process and apparatus therefor

Details Air liquefaction separation process and apparatus therefor Air liquefaction separation process and apparatus therefor

1996-12-10

1998-06-16

Capossela, Ronald C.

Refrigeration

Cryogenic treatment of gas or gas mixture

Separation of gas mixture

62654, F25J 100

Patent

active

057653976

ABSTRACT:
The present invention relates to an air liquefaction separation apparatus whose power cost is reduced. A low-pressure column of a double rectification column has a cleaning section at a lower position, and a liquid oxygen is partly withdrawn from the space above the cleaning section so as to supply it to a main condenser-evaporator. The liquid oxygen supplied to the main condenser-evaporator is subjected to heat exchange with a nitrogen gas separated at the head of a high-pressure column to be gasified into an oxygen gas. This oxygen gas is introduced to the space under the cleaning section. Hydrocarbons contained in the oxygen gas ascending through the cleaning section are removed by the rest of the liquid oxygen descending through the cleaning section to provide a clean oxygen gas. The liquid oxygen passed through the cleaning section is withdrawn from the low-pressure column. Thus, since the hydrocarbons are prevented from being concentrated highly to or over critical levels in the liquid oxygen in the main condenser-evaporator, submergence in the main condenser-evaporator can be reduced to minimize the influence of the depth of the liquid, thus improving heat exchange efficiency to lower the pressure of the nitrogen gas, as well as, to reduce operating cost by reducing power of the compressor for compressing the feed air.

REFERENCES:
patent: 3059439 (1962-10-01), First et al.
patent: 3416323 (1968-12-01), Heinik

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