Air separation
US4783208A · kind A · utility
9Cited by
5References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 20, 1987 |
| Grant date | Nov 8, 1988 |
| Priority date | — |
| Expiry date | Nov 20, 2007 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S62/924
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improvement is provided in a process of separating air in a conventional double rectification column to produce oxygen and argon. In accordance with the invention, refrigeration is transfered to the oxygen-rich liquid conventionally formed in the higher pressure column from oxygen-poor liquid formed by condensing the oxygen-poor vapor formed in the higher pressure column. In addition, a portion of the oxygen-poor liquid is vaporized and either withdrawn as product or expanded in a turbine to provide refrigeration in the process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.