Three-stage membrane gas separation process and system
US5102432A · kind A · utility
56Cited by
19References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1990 |
| Grant date | Apr 7, 1992 |
| Priority date | — |
| Expiry date | Dec 10, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B23/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Very high purity nitrogen is produced by air separation in a three stage membrane system in which the third stage permeate is recycled to the second stage and the membrane surface area is distributed between the stages to achieve high product recovery and process performance. Other gas separations, such as argon from oxygen, can likewise be achieved by thus using a three stage membrane system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.