Process for the purification of nitric oxide
US6576044B1 · kind B1 · utility
34Cited by
17References
30Claims
0Family size
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Key dates
| Filing date | Nov 27, 2000 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Nov 27, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/151
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A gas mixture comprised of nitric oxide and one or more impurities selected from nitrous oxide, nitrogen dioxide, nitrous acid, sulfur dioxide, carbonyl sulfide, water vapor and carbon dioxide is purified by pressure swing adsorption or temperature swing adsorption using a porous, metal-free polymer adsorbent that does not promote the disproportionation of nitric oxide to nitrogen dioxide and nitrogen or nitrous oxide. The adsorption step is preferably carried out at tempereatures in the range of about −120 to about 0° C.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.