Cryogenic production of krypton and xenon from air

Details Cryogenic production of krypton and xenon from air Cryogenic production of krypton and xenon from air

1991-02-05

1992-06-16

Capossela, Ronald C.

Refrigeration

Processes

Circulating external gas

55 66, 423262, F25J 304

Patent

active

051221730

ABSTRACT:
The present invention relates to a process for the production of krypton and xenon from a cryogenic air separation unit. The present invention simultaneously concentrates krypton and xenon while rejecting more than 90% of the methane present in the feed stream. The feed to the process is a liquid oxygen stream which is withdrawn from the main distillation column system of the air separation unit. The improvement of the present invention is the discovery that an optimum liquid to vapor flow is required in the oxygen enriching section of the krypton/xenon column. The optimum range is between 0.05 to 0.2, more preferably about 0.1.

REFERENCES:
patent: 3596471 (1971-08-01), Streich
patent: 3751934 (1973-08-01), Frischbier
patent: 4384876 (1983-05-01), Mori et al.
patent: 4401488 (1983-08-01), LaClair
patent: 4421536 (1983-12-01), Mori et al.
patent: 4568528 (1986-02-01), Cheung
patent: 4647299 (1987-03-01), Cheung
H. Dauer, "New Developments Resulting on Improved Production of Argon, Krypton and Xenom".

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