Method and apparatus for producing nitrogen from air by cryogenic distillation
US6330812A · kind A · utility
3Cited by
9References
15Claims
0Family size
Inventor
Key dates
| Filing date | Feb 1, 2001 |
| Grant date | Dec 18, 2001 |
| Priority date | — |
| Expiry date | Feb 1, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2250/52
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Nitrogen gas at a single pressure is produced from a two-column cryogenic distillation of air. The bottoms liquid product from the high pressure column is divided into portions, at least one of which does not enter the low pressure column as a feed stream. By these means, a portion of an oxygen-rich stream is removed from the distillation, further enhancing nitrogen recovery and achieving low specific energy consumption for nitrogen product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.