Multiple stage semi-permeable membrane process and apparatus for gas separation
US5873928A · kind A · utility
10Cited by
20References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1996 |
| Grant date | Feb 23, 1999 |
| Priority date | — |
| Expiry date | Dec 23, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/226
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A membrane process and apparatus are described for the production of a desired very high purity permeate gas by use of a multiple stage membrane process wherein in a primary stage a process feed gas mixture is provided to a primary membrane separator unit comprising a membrane having a relatively high intrinsic permeability to provide an intermediate permeate gas and a retentate gas, and providing the intermediate permeate gas in a secondary stage to a secondary membrane separator unit comprising a membrane having a relatively low intrinsic permeability, to produce therefrom a very high purity permeate gas product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.