Gas separation using organic-vapor-resistant membranes in conjunction with organic-vapor-selective membranes
US6572679B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2002 |
| Grant date | Jun 3, 2003 |
| Priority date | — |
| Expiry date | Mar 25, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01B2203/147
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for treating a gas mixture containing at least an organic compound gas or vapor and a second gas, such as natural gas, refinery off-gas or air. The process uses two sequential membrane separation steps, one using membrane selective for the organic compound over the second gas, the other selective for the second gas over the organic vapor. The second-gas-selective 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. The membrane steps can be combined in either order.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.