Process and installation for the production of ultra-pure nitrog

Details Process and installation for the production of ultra-pure nitrog Process and installation for the production of ultra-pure nitrog

1993-10-06

1995-06-06

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

62 25, 62 37, 62 40, F25J 300

Patent

active

054211646

ABSTRACT:
According to this process, there is produced gaseous nitrogen of medium purity under substantially the production pressure. This nitrogen is sent to the base of a distillation column (11) provided with a head condenser (23). The head condenser is cooled by means of liquid in the base of the low pressure column and if desired the liquid nitrogen at medium purity contained in a reservoir (10). Ultra-pure nitrogen is withdrawn as a product from the head of the column, and during periods of no production of nitrogen of medium purity and during periods in which the demand for ultra-pure nitrogen exceeds this production, there is sent to the base of the column gaseous reserve nitrogen of medium purity obtained from the liquid nitrogen of the reservoir and there is sent into the head condenser a relatively large flow of liquid nitrogen from this reservoir.

REFERENCES:
patent: 4853015 (1989-08-01), Yoshino
patent: 5157927 (1992-10-01), Darchis et al.
patent: 5209070 (1993-05-01), Darredeau
patent: 5224336 (1993-07-01), Agrawal et al.

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