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Title: 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:
 [1];  [2];  [3]
  1. (Palo Alto, CA)
  2. (San Francisco, CA)
  3. (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) OAK
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 = {1997},
month = {5}
}

Patent:

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