Process to ultrapurify liquid nitrogen imported as back-up for nitrogen generating plants
US5058387A · kind A · utility
4Cited by
8References
32Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1989 |
| Grant date | Oct 22, 1991 |
| Priority date | — |
| Expiry date | Jul 5, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S62/913
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
An improved nitrogen generator having a distillation column for separating oxygen and nitrogen, the column having a top and a bottom and a rising vapor stream and a descending liquid stream in countercurrent contact with each other, the improvement comprising means for introducing an amount of liquid nitrogen into the column at an intermediate point in the column wherein the liquid stream composition at said point is substantially equivalent to the liquid nitrogen composition and a means for withdrawing a substantially equivalent amount of purified liquid nitrogen from the top of the column.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.