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Surprising olefin/paraffin separation performance recovery of highly aged carbon molecular sieve hollow fiber membranes by a super-hyperaging treatment

Journal Article · · Journal of Membrane Science
 [1];  [2];  [3];  [3];  [3];  [2];  [2];  [2];  [2];  [3]
  1. Georgia Institute of Technology, Atlanta, GA (United States). School of Chemical & Biomolecular Engineering; Georgia Institute of Technology, Atlanta, GA (United States)
  2. The Dow Chemical Company, Freeport, TX (United States)
  3. Georgia Institute of Technology, Atlanta, GA (United States). School of Chemical & Biomolecular Engineering
Carbon molecular sieve (CMS) hollow fibers derived from 6FDA1:BPDA1/DAM2, a well-studied polyimide precursor with attractive propylene/propane separation performance, were purposely treated to simulate long time aging under storage conditions. A simple, efficient post-aging thermal-treatment regeneration termed “super-hyperaging” is shown here to recover C3H6 permeance with satisfactory C3H6/C3H8 selectivity. A super-hyperaging temperature around 280 °C in air is shown to provide an optimum tradeoff in permeance and selectivity for highly aged samples. The regenerated CMS membrane displays performance well beyond the polymer permeance-selectivity tradeoff upper bound, and a hypothetical mechanism for the super-hyperaging recovery of aged CMS fibers is discussed in this work.
Research Organization:
Georgia Institute of Technology, Atlanta, GA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC)
Grant/Contract Number:
FG02-04ER15510
OSTI ID:
1849493
Alternate ID(s):
OSTI ID: 1760923
Journal Information:
Journal of Membrane Science, Journal Name: Journal of Membrane Science Journal Issue: C Vol. 620; ISSN 0376-7388
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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