Membrane plant: automatic control of
US5470379A · kind A · utility
38Cited by
11References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 7, 1993 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Jan 7, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D53/22
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Air is separated in a vessel housing gas separation membranes. A flow control valve controls the passage of air to an inlet header of the vessel. The setting of the valve is adjusted in accordance with the level of oxygen impurity in product nitrogen leaving the vessel for an outlet header. A second flow control valve is provided and is of a kind whereby product nitrogen is able to be delivered at a constant flow rate over a range of different pressures upstream thereof. Accordingly, the apparatus is able to deliver nitrogen at a desired purity and flow rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.