Composite gas separation membrane having a gutter layer comprising a crosslinked polar phenyl-containing - organopolysiloxane, and method for making the same -
US5286280A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 31, 1992 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Dec 31, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D71/701
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
This invention provides a composite gas separation membrane comprising: (a) a porous polyacrylonitrile structural support material having a polyacrylonitrile surface; (b) a gutter layer coating comprising a crosslinked polar phenyl-containing-organopolysiloxane material on the polyacrylonitrile surface of the structural support material, leaving an uncoated gutter layer surface; and (c) an ultrathin 6FDA type polyimide selective membrane layer coating on the uncoated gutter layer surface. In preferred embodiments, the phenyl-containing-organopolysiloxane material additionally comprises a silica-sol. Processes for making the composite gas separation membrane and for using the membrane to carry out gas separations are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.