Patent ID: 8192527
Filing Date: 2012-06-05
Classification: B01D,C01B,Y02C,Y02P

Abstract:
1. 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 b) a stage of adsorption at high pressure P c) a stage of cocurrent or counter-current depressurization of the stream from stage b) until the desorption pressure P d) a cocurrent or counter-current desorption stage at high pressure P 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.