Process for recovering nitrogen in low pressure type air separat

Details Process for recovering nitrogen in low pressure type air separat Process for recovering nitrogen in low pressure type air separat

1980-05-14

1981-11-10

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62 39, F25J 304

Patent

active

042996074

ABSTRACT:
In a low pressure type air separation apparatus provided with a reversing heat exchanger for removing water vapor and carbon dioxide gas in feed air, a nitrogen gas taken out of a high pressure column in a duplex type rectification tower is led to an expander for generating subcooling for the air separation apparatus, and the effluent nitrogen gas is obtained under a predetermined pressure by controlling a pressure of the effluent gas from the expander. The effluent nitrogen gas is adjusted to a temperature satisfactory for the inlet temperature conditions for the reversing heat exchanger by passing the effluent nitrogen gas through a heat exchanger, and then is passed through the reversing heat exchanger, whereby the effluent gas from the reversing exchanger is obtained as a product nitrogen gas under a predetermined pressure.

REFERENCES:
patent: 3735599 (1973-05-01), Izumichi et al.
patent: 3736762 (1973-06-01), Toyama et al.

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