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US 8,999,037 B2Granted
Carbon molecular sieve membrane (CMSM) performance tuning by dual temperature secondary oxygen doping (DTSOD)
AssigneeGeorgia Tech Research Corporation
InventorsRachana Singh, William John Koros
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Abstract
The various embodiments of the disclosure relate generally to carbon molecular sieve membranes (CMSM) and their associated fabrication processes, and more particularly to CMSM that maintain high gas selectivities without losing productivity. Methods for enriching a mixture of gases in one gas via the use of the CMS membranes, and gas enrichment devices using the same, are also disclosed.
Claims32
A carbon molecular sieve prepared by a method comprising:
- pyrolyzing a polymer membrane in a first heat treatment in a first oxygen environment comprising less than 5 ppm oxygen;
- and
- subjecting the pyrolyzed polymer membrane to a second heat treatment in a second oxygen environment;
- wherein the second heat treatment occurs at a temperature above the first heat treatment;
- and
- wherein the second oxygen environment has a higher concentration of oxygen than the first oxygen environment.
3 more elements
Dependencies are inferred from the claim text.