Method and apparatus for recovering argon from an air fractionat

Details Method and apparatus for recovering argon from an air fractionat Method and apparatus for recovering argon from an air fractionat

1976-03-22

1977-11-08

Bernstein, Hiram H.

Refrigeration

Processes

Circulating external gas

62 30, 62 42, F25J 304

Patent

active

040574075

ABSTRACT:
A method for the purification of argon in a gas obtained as a by-product from the fractionation of air to the recover O.sub.2 and N.sub.2 is described. The argon-containing gas is fed to a single argon-rectifying column which separates oxygen and then to a conventional purification column in which the separation takes place. The apparatus for carrying out the method comprises a rectification column having the top connected to a heating compressing and cooling circuit for liquefying and recycling in the liquid state the evolved vapors; the bottom of the column is heated by a fraction of the compressed but not cooled gaseous mixture drawn from the heating and compressing section of said circuit; the end section of this latter being further connected to a conventional nitrogen-withdrawing column for feeding a portion of the oxygen-free liquefied product.

REFERENCES:
patent: 2530602 (1950-11-01), Dennis
patent: 2700282 (1955-01-01), Roberts
patent: 3037359 (1962-06-01), Knapp

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