Semi-permeable membrane separation process for the production of very high purity nitrogen
US5693121A · kind A · utility
3Cited by
22References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1995 |
| Grant date | Dec 2, 1997 |
| Priority date | — |
| Expiry date | Nov 9, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B2210/0051
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A semi-permeable gas membrane process is described for the separation of very high purity nitrogen from a process feed gas mixture that is predominantly nitrogen, and one or more other permeable gases, which process comprises providing a feed gas mixture under pressure to a membrane separator unit comprising a semi-permeable separation membrane with respect to which the largest fraction of the other permeable gases is at least 20 times more permeable than nitrogen, to provide a very high purity raffinate nitrogen gas product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.