Dual column nitrogen producing air separation unit with split kettle reboil and integrated condenser-reboiler
US11933540B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2023 |
| Grant date | Mar 19, 2024 |
| Priority date | — |
| Expiry date | Apr 13, 2043 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2250/20
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Enhancements to a dual column, nitrogen producing cryogenic air separation unit are provided. Such enhancements include an improved air separation cycle that uses multiple condenser-reboilers and recycles a portion of the vapor from one or more of the condenser-reboilers to the incoming feed stream and or the compressed purified air streams to yield improvements in such dual column, nitrogen producing cryogenic air separation units. The multiple condenser-reboilers preferably include an integrated condenser-reboiler arrangement comprising a heat exchanger having a set of nitrogen condensing passages, a first set and second set of boiling passages, and a phase separator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.