Nitrogen gas separation using organic-vapor-resistant membranes
US6579341B2 · kind B2 · utility
76Cited by
56References
56Claims
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Key dates
| Filing date | Mar 18, 2002 |
| Grant date | Jun 17, 2003 |
| Priority date | — |
| Expiry date | Mar 18, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E50/30
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for separating nitrogen from a multicomponent gas mixture containing nitrogen and a hydrocarbon, such as natural gas or associated gas, using gas-separation membranes selective for nitrogen over the hydrocarbon. The membranes use a selective layer made from a polymer having repeating units of a fluorinated polymer, and demonstrate good resistance to plasticization by the organic components in the gas mixture under treatment, and good recovery after exposure to liquid aromatic hydrocarbons.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.