Compression of nitrogen overhead from high pressure column in tractionation of air
US4211544A · kind A · utility
4Cited by
4References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 17, 1978 |
| Grant date | Jul 8, 1980 |
| Priority date | — |
| Expiry date | Apr 17, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2270/90
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In a process for the low-temperature fractionation of air by two-stage rectification wherein nitrogen is withdrawn in the gaseous phase from the upper portion of the high-pressure column, warmed, compressed, cooled, liquefied, and recycled into the upper portion of the high-pressure column, the improvement which comprises conducting the liquefying of the nitrogen in heat exchange with evaporating oxygen in the lower portion of the low-pressure column. This process is particularly amenable to the use of LNG as refrigerant where LNG must be vaporized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.