Refrigeration – Processes – Circulating external gas
Patent
1993-12-02
1994-11-15
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 39, F25J 302
Patent
active
053636562
ABSTRACT:
A generator produces ultra-high purity nitrogen and ultra-high purity oxygen simultaneously by the liquefaction and rectification of feed air. Feed air is rectified in a first rectification column, and nitrogen gas separated to the top of that column is liquefied, in a nitrogen condenser, by oxygen-enriched liquid air separated to the bottom portion of the first rectification column. The oxygen-enriched liquid is fed to the upper portion of a second rectification column having a reboiler at its bottom, so that through rectification oxygen gas is fed from above a liquid reservoir to the lower portion of a third rectification column. Through rectification of the oxygen gas in the third rectification column, high purity oxygen gas, from which impurities having boiling points higher than that of oxygen have been removed by liquefaction, is fed to the center portion of a fourth rectification column which has a condenser in its top portion and a reboiler in its bottom portion. Through rectification of the high purity oxygen gas in the fourth rectification column, impurities having boiling points lower than that of oxygen are exhausted from the top portion thereof as non-condensed gas and ultra-high purity liquid oxygen is separated to the bottom thereof.
REFERENCES:
patent: 4977746 (1990-12-01), Grenier et al.
patent: 5019145 (1991-05-01), Rohde
patent: 5069699 (1991-12-01), Aerawal
patent: 5195324 (1993-03-01), Cheung
patent: 5205127 (1993-04-01), Agrawal
Nagamura Takashi
Yamamoto Takao
Capossela Ronald C.
L'Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation De
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