Method of and apparatus for producing superpure nitrogen

Details Method of and apparatus for producing superpure nitrogen Method of and apparatus for producing superpure nitrogen

1990-05-31

1992-06-16

Bennet, Henry A.

Refrigeration

Processes

Circulating external gas

62 44, 62 31, 62 32, 62 24, 62 17, F25J 300, F25J 302

Patent

active

051221756

ABSTRACT:
The present invention consists in that a nitrogen gas line and a liquid nitrogen line are subjected to hot-blast baking with clean nitrogen gas and a gas containing oxygen, whereby outgasses such as moisture to develop from heat exchangers, valves and piping can be excluded. Moreover, in order to obtain nitrogen gas of very high purity, liquid nitrogen of low contents of high-boiling components as subjected to rectifying separation is derived and gasified, and the liquid nitrogen is introduced into co-adsorbers so as to absorb and remove carbon monoxide difficult of separation by the rectifying separation, whereupon the liquid nitrogen and the nitrogen gas are obtained as products.

REFERENCES:
patent: 2968160 (1961-01-01), Schilling et al.
patent: 3181306 (1965-05-01), Geist et al.
patent: 4152130 (1979-05-01), Theobald
patent: 4202678 (1980-05-01), Hvizdos
patent: 4289515 (1981-09-01), Yearout
patent: 4617037 (1986-10-01), Okada et al.
patent: 4617040 (1986-10-01), Yoshino
patent: 4671813 (1987-06-01), Yoshino
patent: 4834785 (1989-05-01), Ayres
patent: 4853015 (1989-08-01), Yoshino

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