Method and installation for low temperature separation of air
US11976880B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 20, 2019 |
| Grant date | May 7, 2024 |
| Priority date | — |
| Expiry date | Apr 13, 2041 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J3/0489
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for low temperature separation of air using an air separating installation having a distillation column system which has a first, a second, a third and a fourth separating unit. Compressed and cooled air is fed into the first separating unit. An oxygen-enriched, nitrogen-depleted, argon-containing first sump liquid and a nitrogen-enriched, oxygen-depleted first head gas are formed by means of the first separating unit. An oxygen-rich second sump liquid and an argon-enriched second head gas are formed by means of the second separating unit. A liquid return to the second separating unit is provided by means of the third separating unit. A fourth sump liquid and a fourth head gas are formed by means of the fourth separating unit, and the fourth sump liquid is at least partially returned to the second separating unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.