Cryogenic rectification process for producing ultra high purity nitrogen
US4902321A · kind A · utility
15Cited by
8References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 16, 1989 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Mar 16, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2270/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for producing ultra high purity nitrogen from nitrogen produced by the cryogenic rectification of air wherein superatomospheric nitrogen is progressively condensed and revaporized to effect rejection of lower boiling impurities without need for additional energy beyond that contained in the nitrogen input.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.