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Cryogenic recovery of high purity hydrogen

  • US 4,756,730 A
  • Filed: 08/08/1986
  • Issued: 07/12/1988
  • Est. Priority Date: 08/08/1986
  • Status: Expired due to Fees
First Claim
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1. A process for the cryogenic purification of two or more industrial by-product gas streams containing impure hydrogen in recoverable amounts, at least one of the by-product gas streams being substantially free of non-readily condensible impurities having boiling points below that of methane and containing only hydrocarbons, including methane, as impurities, and at least one of the by-product gas streams containing significant amounts of non-readily condensible impurities having boiling points below that of methane, comprising:

  • separately passing the by-product gas streams substantially free of non-readily condensible impurities constituting a first feed stream, and the by-product gas streams containing significant amounts of non-readily condensible impurities constituting a second feed stream, through cooling and separation stages to separate, at each stage, a hydrogen containing gas stream overhead fraction from a condensed bottom fraction, the hydrogen containing gas stream overheads from said second feed stream also containing the non-readily condensible impurities,feeding the hydrogen containing gas stream overhead fraction of said second feed stream from the last of the separation stages to a methane absorber,feeding the first feed stream'"'"'s bottom fraction from the last of the separation stages to the methane absorber, andrecovering a purified overhead hydrogen gas stream from the methane absorber.

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