Cryogenic recovery of high purity hydrogen
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United States of America Patent
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Jul 12, 1988
Grant Date -
N/A
app pub date -
Aug 8, 1986
filing date -
Aug 8, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process for the cryogenic purification of industrial by-product hydrogen streams to recover a high yield of a high purity hydrogen product is disclosed in which two or more of such by-product streams, one containing detrimental amounts of non-readily condensible impurities having boiling points below that of methane, e.g., nitrogen, helium and the like, the other containing by-product hydrogen gas streams which are substantially free of non-readily condensible impurities. These two feed streams are then separately passed through successive cooling and separation stages. At each separation stage, a liquid bottom fraction containing readily condensible hydrocarbons is separated from the overhead of each of the two feed streams. Successive separations are carried out until the overhead from the stream which is substantially free of non-readily condensible impurities (but which contains a significant amount of readily condensible impurities, including methane) attains the desired degree of purity. At this point, the bottom fraction of this stream is predominantly liquid methane, and this bottom fraction is used to scrub a preponderance of nitrogen and like impurities from the overheads of the stream containing significant amounts of these non-readily condensible impurities.
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