Compression of nitrogen overhead from high pressure column in tr

Details Compression of nitrogen overhead from high pressure column in tr Compression of nitrogen overhead from high pressure column in tr

1978-04-17

1980-07-08

Yudkoff, Norman

Refrigeration

Processes

Circulating external gas

62 41, 62 38, 62 40, F25J 304

Patent

active

042115442

ABSTRACT:
In a process for the low-temperature fractionation of air by two-stage rectification wherein nitrogen is withdrawn in the gaseous phase from the upper portion of the high-pressure column, warmed, compressed, cooled, liquefied, and recycled into the upper portion of the high-pressure column, the improvement which comprises conducting the liquefying of the nitrogen in heat exchange with evaporating oxygen in the lower portion of the low-pressure column. This process is particularly amenable to the use of LNG as refrigerant where LNG must be vaporized.

REFERENCES:
patent: 2627731 (1953-02-01), Benedict
patent: 2685181 (1954-08-01), Schlitt
patent: 3173778 (1965-03-01), Gaumer, Jr.
patent: 3251190 (1966-05-01), Seidel

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