LIMITING OF IMPURITY PEAKS

摘要

A process of purifying or separating a feed gas stream containing hydrogen H₂ and a molar content of carbon monoxide (CO) greater than or equal to 1000 ppm, in which: a) said feed gas stream is introduced continuously into a first purification unit (10) of the PSA type containing a first adsorbent on which the CO is preferably adsorbed; b) the gas originating from step a), at least partially purified of CO and having an average molar CO content T less than or equal to Tacc and selectively a first maximum CO content TMo greater than Tacc, is recovered; c) the gas originating from step b) is introduced into a downstream adsorber (20) containing at least a second adsorbent (21) on which the CO is preferably adsorbed; d) the H₂-enriched gas originating from step c) having an average CO content T and a maximum CO content TMi that are both less than or equal to Tacc, is recovered, characterized in that Tacc is less than or equal to 100 ppm.