Cryogenic process for nitrogen production with oxygen-enriched recycle
US4867773A · kind A · utility
15Cited by
7References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1988 |
| Grant date | Sep 19, 1989 |
| Priority date | — |
| Expiry date | Oct 6, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2200/72
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process is set forth for recovery of nitrogen from a feed gas stream, containing nitrogen and oxygen, using a cryogenic separation wherein a recycle stream having an oxygen content above that of the feed gas stream is recycled separately and independent of the feed gas stream to the cryogenic separation zone without any intervening process step that would decrease the oxygen content of the recycle stream.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.