System and method for enhanced argon recovery from a feed stream comprising hydrogen, methane, nitrogen and argon
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United States of America Patent
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Sep 11, 2018
Grant Date -
Sep 21, 2017
app pub date -
Mar 9, 2017
filing date -
Mar 21, 2016
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Abstract
A system and method for argon and nitrogen extraction from a feed stream comprising hydrogen, methane, nitrogen and argon, such as tail gas of an ammonia production plant is provided. The disclosed system and method provides for nitrogen-argon rectification and the methane rejection within a column system comprised of at least one distillation column. Nitrogen and argon are further separated and to produce liquid products. An argon stripping column arrangement is disclosed where residual argon is further removed from the methane-rich fuel gas and recycled back to the feed stream.
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