Patent ID: 7892328

Claim:
A PSA apparatus for high-purity hydrogen gas production by removing CO, CO2, N2 and/or Ar by adsorption from a hydrogen-containing gas, comprising: an adsorption tower; and an adsorbent bed in said adsorption tower, successively including a CO adsorbent layer for selectively adsorbing CO gas without substantial adsorption of CO2, N2 and/or Ar, a carbonaceous adsorbent layer for adsorbing CO2, and after said two layers further including a zeolite layer for adsorbing N2, and/or an adsorbent layer for adsorbing Ar in random order in the direction from the upstream side to the downstream side of passage of the hydrogen-containing gas, wherein, on the occasion of regeneration of said adsorbent bed, a purge gas is passed through in the direction opposite to the direction of passage of the hydrogen-containing gas.