Patent ID: 8192527

Claim:
A method of producing hydrogen of very high purity from a feed predominantly containing said hydrogen and a minor part of impurities comprising mainly carbon dioxide, carbon monoxide, methane and heavier hydrocarbons, said feed being introduced into at least one adsorption column made up of a plurality of beds, said method comprising at least the following stages: a) a stage of partial or complete, cocurrent or counter-current pressurization of said feed until the pressure of the adsorption stage (P ads ) is reached, by an additional pure hydrogen or feed stream, b) a stage of adsorption at high pressure P ads of the impurities of the feed pressurized in stage a), carried out on an adsorbent solid contained in one or more beds, c) a stage of cocurrent or counter-current depressurization of the stream from stage b) until the desorption pressure P des above 0.4 MPa is reached, d) a cocurrent or counter-current desorption stage at high pressure P des , said pressure P des being lower than the adsorption stage pressure, wherein at least one adsorbent making up a bed or part of a bed has a carbon dioxide dynamic capacity of at least 2 mole/g between an adsorption pressure (P ads ) of 5 MPa and a CO 2 desorption pressure (P des ) of 0.4 MPa, the dynamic capacity being defined as the difference between the amount of CO 2 adsorbed under the adsorption stage conditions and the amount that remains adsorbed after desorption.