Patent ID: 11945721
Assignee: AIR PRODUCTS AND CHEMICALS, INC.
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  F | IPC B  C

Claim 2:
3. A process for the purification of a hydrogen feed stream comprising hydrogen, oxygen, and one or more impurities selected from the group consisting of nitrogen, argon, methane, carbon monoxide, carbon dioxide, and water, the process comprising:
cooling the hydrogen feed stream to produce a cooled hydrogen stream;
passing the cooled hydrogen stream through an online adsorber at a temperature below 80 K to adsorb the one or more impurities and produce a pure hydrogen stream and a loaded adsorber;
passing an inert regeneration gas stream through the loaded adsorber at a temperature between 0° C. and 50° C. and pressure to regenerate the loaded adsorber and produce a spent regeneration gas stream enriched in oxygen; and
separating a crude hydrogen stream by an adsorption process using a plurality of adsorbent beds to produce the hydrogen feed stream and an impurities-enriched hydrogen-depleted tail gas stream,
wherein the adsorption process comprises a counter-current purge step during which a purge gas is introduced to remove one or more crude impurities selected from nitrogen, argon, methane, carbon monoxide, carbon dioxide, and water, from the plurality of adsorbent beds; and
wherein the purge gas comprises at least a portion of the spent regeneration gas stream.