Process for the purification of nitric oxide
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United States of America Patent
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Sep 23, 1997
Grant Date -
N/A
app pub date -
Sep 25, 1995
filing date -
Sep 30, 1993
priority date (Note) -
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Abstract
A gas mixture comprised of nitric oxide and, optionally an inert gas, and containing small amounts of nitrogen dioxide, and perhaps moisture and sulfur dioxide, is purified by passing the gas stream through a bed of zeolite having a silica to alumina ratio not greater than about 200. The concentration of nitrogen dioxide, sulfur dioxide and moisture in the gas stream are reduced to about 1 ppm or less as the gas mixture passes through the bed of zeolite.
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