Process for restoring membrane permeation properties
Abstract
A process for restoring the selectivity of high-flee-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.
- Inventors:
-
- Palo Alto, CA
- San Francisco, CA
- San Jose, CA
- Issue Date:
- Research Org.:
- Membrane Technology & Res Inc
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 870956
- Patent Number(s):
- 5630970
- Application Number:
- 08/448652
- Assignee:
- Membrane Technology and Research, Inc. (Menlo Park, CA)
- Patent Classifications (CPCs):
-
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01D - SEPARATION
B - PERFORMING OPERATIONS B29 - WORKING OF PLASTICS B29C - SHAPING OR JOINING OF PLASTICS
- DOE Contract Number:
- FG03-90ER81066; FG03-94ER81811
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- process; restoring; membrane; permeation; properties; selectivity; high-flee-volume; glassy; polymer; membranes; condensable; components; less-condensable; non-condensable; gas; mixture; involves; exposing; suitable; sorbent; vapor; propane; butane; reopening; microvoids; free; volume; aged; restored; 70-100; original; value; age; time; maintained; keeping; environment; process involves; gas mixture; polymer membrane; polymer membranes; membrane permeation; free volume; suitable sorbent; involves exposing; /264/
Citation Formats
Pinnau, Ingo, Toy, Lora G, and Casillas, Carlos G. Process for restoring membrane permeation properties. United States: N. p., 1997.
Web.
Pinnau, Ingo, Toy, Lora G, & Casillas, Carlos G. Process for restoring membrane permeation properties. United States.
Pinnau, Ingo, Toy, Lora G, and Casillas, Carlos G. Tue .
"Process for restoring membrane permeation properties". United States. https://www.osti.gov/servlets/purl/870956.
@article{osti_870956,
title = {Process for restoring membrane permeation properties},
author = {Pinnau, Ingo and Toy, Lora G and Casillas, Carlos G},
abstractNote = {A process for restoring the selectivity of high-flee-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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue May 20 00:00:00 EDT 1997},
month = {Tue May 20 00:00:00 EDT 1997}
}
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Works referenced in this record:
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- Nakagawa, T.; Saito, T.; Asakawa, S.
- Gas Separation & Purification, Vol. 2, Issue 1