Process for determining amount of argon contamination in oxygen

Details Process for determining amount of argon contamination in oxygen Process for determining amount of argon contamination in oxygen

1996-09-04

1998-06-09

Spitzer, Robert

Gas separation: processes

Chromatography

95 96, 95138, 96101, 96108, B01D 1508, B01D 5347

Patent

active

057626863

ABSTRACT:
A process for determining the amount of argon contamination present in high purity oxygen employing a combination apparatus including a gas chromatography apparatus, a pressure swing adsorption apparatus, and a conduit connecting the two apparatus to each other. The gas chromatography apparatus can be run with its column at about 70.degree. F. (21.1.degree. C.) or higher. A sample of the high purity oxygen is fed to the pressure swing adsorption apparatus, where a portion of the oxygen is removed, and then the thus modified sample is fed through the conduit to the gas chromatography apparatus. Since some of the oxygen has been removed with the pressure swing adsorption apparatus, the graph generated by the gas chromatography apparatus shows 2 resolved peaks, namely a small argon peak preceding a large oxygen peak, even though the column of the gas chromatography apparatus is not being cooled to cryogenic temperatures with a cryogen. Also, instead of first subjecting the high purity oxygen to the pressure swing apparatus, a sample is fed directly to the gas chromatography apparatus, which produces a graph that has only 1 large peak due to the oxygen which masks the small argon peak. By comparing the 2 graphs, an accurate determination can be made of the amount of argon contamination in the high purity oxygen.

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Technical Information Bulletin (1994) from Whatman Inc. entitled "Installation, Operation and Maintenance Whatman.RTM. 76-92 and 76-94 Ultra Pure Nitrogen Generators", pp. 1-2.

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