Dry, high purity nitrogen production process and system
US4934148A · kind A · utility
47Cited by
17References
17Claims
0Family size
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Key dates
| Filing date | May 12, 1989 |
| Grant date | Jun 19, 1990 |
| Priority date | — |
| Expiry date | May 12, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02C20/40
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Feed air to a prepurifier adsorption system/cryogenic air separation system for dry, high purity nitrogen and/or oxygen production is dried in a membrane dryer preferably characterized by a countercurrent flow path. Drying is enhanced by the use of purge gas on the permeate side of the membrane dryer, which adsorption system or cryogenic air separation system product or waste gas, dried feed air or ambient air being used as purge gas.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.