Low energy high purity oxygen increased delivery pressure

Details Low energy high purity oxygen increased delivery pressure Low energy high purity oxygen increased delivery pressure

1987-02-26

1988-11-01

Warner, Steven E.

Refrigeration

Processes

Circulating external gas

62 25, 62 31, 62 34, 62 38, F25J 304

Patent

active

047817399

ABSTRACT:
The low energy triple distillation pressure process for producing high purity industrial oxygen is improved in several ways, including higher O.sub.2 pressure, higher recovery of both oxygen and crude argon, and lower N.sub.2 content in the argon. This is done with the traditional triple pressure column arrangement (columns 22, 24, and 27 of FIG. 1) preferably by totally condensing liquid air in reboiler 21 and then splitting it with valves 42 and 43; by providing all LN.sub.2 reflux duty from reboiler 26; by evaporating product oxygen in 23 with partially condensing air; and by intermediate refluxing column 27 with condenser 28 which provides a separate vapor stream to column 22.

REFERENCES:
patent: 3688513 (1972-09-01), Streich
patent: 3751933 (1973-08-01), Balabaev et al.
patent: 4433989 (1984-02-01), Erickson
patent: 4464191 (1984-08-01), Erickson
patent: 4578095 (1986-03-01), Erickson
Streich, et al., "Production of Large Quantities of Oxygen by an Improved Two Column Process", XIV Int'l Congress of Refrigeration, 09-1975, pp. 513-519.

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