Air separation process with waste recycle for nitrogen and oxygen production
US4869742A · kind A · utility
4Cited by
13References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1988 |
| Grant date | Sep 26, 1989 |
| Priority date | — |
| Expiry date | Oct 6, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J3/04333
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention is an improved process for the production of nitrogen and oxygen that uses a double distillation column arrangement. The improvement to the process is the recycling of at least a portion of the oxygen-enriched waste stream to the bottom of the high pressure column. As a result of this improvement, the process is capable of making a nitrogen product with high purity (e.g., 5 ppm oxygen product) at high pressures (e.g., 40 to 150 psia) while simultaneously producing high purity oxygen (e.g., 99.6% oxygen). Nitrogen is produced only from the high pressure column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.