Air separation process and system utilizing pressure-swing driers
US3967464A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1974 |
| Grant date | Jul 6, 1976 |
| Priority date | — |
| Expiry date | Jul 22, 1994 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25J2250/52
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A cryogenic air separation system is described in which pressure-swing adsorption driers are used to remove virtually all of the moisture from the feed air prior to the passage of the feed air stream through reversing heat exchangers which remove the carbon dioxide. The reversing heat exchangers are regenerated by at least one outgoing product nitrogen stream, while the adsorption driers are regenerated by all or a portion of a low pressure stream withdrawn from the low pressure column the composition of which may be rich in either nitrogen or oxygen depending upon whether the volume of product nitrogen or oxygen is to be maximized. A portion of this low pressure stream may be recovered as a dry product stream, while an additional stream of high purity product oxygen may also be recovered.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.