Process for capturing nitrogen from air using gas separation membranes
US4894068A · kind A · utility
49Cited by
17References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1988 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | Dec 27, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B21/0444
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Nitrogen gas of high purity is produced from compressed air by contacting the air with a first gas membrane separator permitting oxygen to permeate therethrough selectively while restraining the passage of nitrogen. The nonpermeant gas is then brought into contact with a second gas membrane separator of similar construction. The use of the serially arranged separators provides nitrogen gas with very low levels of oxygen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.