Process for restoring membrane permeation properties
Patent
·
OSTI ID:489092
A process is described for restoring the selectivity of high-free-volume, glassy polymer membranes for condensable components over less-condensable components or non-condensable components of a gas mixture. The process involves exposing the membrane to suitable sorbent vapor, such as propane or butane, thereby reopening the microvoids that make up the free volume. The selectivity of an aged membrane may be restored to 70--100% of its original value. The selectivity of a membrane which is known to age over time can also be maintained by keeping the membrane in a vapor environment when it is not in use. 8 figs.
- Research Organization:
- Membrane Technology and Research, Inc
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG03-90ER81066; FG03-94ER81811
- Assignee:
- Membrane Technology and Research, Inc., Menlo Park, CA (United States)
- Patent Number(s):
- US 5,630,970/A/
- Application Number:
- PAN: 8-448,652
- OSTI ID:
- 489092
- Resource Relation:
- Other Information: PBD: 20 May 1997
- Country of Publication:
- United States
- Language:
- English
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