Purification of hydrogen flowstreams by selectively adsorbing impurities therefrom
US6464756B1 · kind B1 · utility
37Cited by
21References
7Claims
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Key dates
| Filing date | Jan 26, 1998 |
| Grant date | Oct 15, 2002 |
| Priority date | — |
| Expiry date | Jan 26, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S95/902
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Predominantly hydrogen gaseous flowstreams containing contaminating amounts of at least carbon monoxide and/or nitrogen impurities are purified by PSA adsorption of such impurities therefrom, via transport over a faujasite zeolite adsorbent, the Si/Al ratio of which ranges from 1 to 3, preferably from 1 to 1.5, and at least 85% of the aluminum tetrahedra comprising the crystal lattices being combined with lithium and calcium cations, the lithium/lithium+calcium ratio therein being at least 70%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.