Process for producing nitrogen dioxide-free oxygen-enriched gas
US3930813A · kind A · utility
49Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 27, 1974 |
| Grant date | Jan 6, 1976 |
| Priority date | — |
| Expiry date | Nov 27, 1994 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/54
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Membrane permeation processes to produce oxygen-enriched gas from atmospheric air are improved by initially contacting an ambient air feed with triethanolamine to substantially reduce the nitrogen dioxide content in the air and thereafter feeding the nitrogen dioxide depleted air to an array of membrane cells and finally withdrawing the oxygen-enriched permeate output therefrom, substantially free of nitrogen dioxide, for further use.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.