Method and apparatus for producing nitrogen by cryogenic distillation of air
US9476640B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 15, 2011 |
| Grant date | Oct 25, 2016 |
| Priority date | — |
| Expiry date | Jun 19, 2033 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2220/44
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In a method for producing nitrogen by cryogenic distillation, air containing carbon monoxide is sent to a cryogenic distillation column (5), a flow D of nitrogen is taken from the top of the distillation column, with a CO content less than a fixed value S1, and a flow of nitrogen-rich cryogenic liquid coming from an external source (7) is sent to the top of the column, the flow rate of cryogenic liquid sent to the column being less than a value V if the CO content in the air does not exceed a previously defined threshold (S0), and the flow rate of cryogenic liquid sent to the column being greater than a value V if the carbon monoxide content of the air exceeds this previously defined threshold (S0).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.