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Apparatus and procedure to reduce impurities in helium to less than one part per billion.

Authors
Seitz-CA; Bodine-WM; Klingman-CL
Source
J Chromatogr Sci 1971 Jan; 9(1):29-31
NIOSHTIC No.
10010498
Abstract
Certain scientific applications require helium of greater purity than that routinely available. This paper describes a laboratory- size apparatus which reduces impurities in helium to less than 1 part per billion. The unit employs easily available, low-cost liquid nitrogen as a refrigerant to cool activated charcoal for the cyclic adsorption of impurities. The essential differences between the new purifier and previous adsorption units are the use of highly purified helium to purge and repressure the charcoal during and after regeneration and regeneration of the adsorbent before neon emerges. The unit produces a few hundred cubic centimeters of highly purified helium per minute, the amount depending upon the helium pressure required and the chosen cycle time. Continuous safe operation is achieved with only periodic observation and requires about 20 liters of liquid nitrogen per day.
CODEN
JCHSBZ
Publication Date
19710101
Document Type
OP; Journal Article
Fiscal Year
1971
NTIS Accession No.
NTIS Price
Identifying No.
OP 26-71
Issue of Publication
1
ISSN
0021-9665
NIOSH Division
HEFO
Source Name
Journal of Chromatographic Science
State
TX
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