Separation membrane and method of preparing and using same
US4527999A · kind A · utility
124Cited by
29References
40Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 23, 1984 |
| Grant date | Jul 9, 1985 |
| Priority date | — |
| Expiry date | Mar 23, 2004 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D67/0095
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A differential pore-collapsed separation membrane particularly useful as a gas-separation membrane and a method of preparing such differential pore-collapsed membrane, which method comprises treating an asymmetric membrane, while under one-sided constraint, with a treating solution comprising a volatile nonsolvent and a swelling agent and/or a solvent, and drying the treated membrane, to provide for the controlled, differential pore collapse of the small pores of the top skin of the membrane to a smaller pore-size distribution in the membrane generally less than about 10 Angstroms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.