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US 12,636,618 B1Granted
Asymmetric carbon molecular sieve hollow fiber membranes
AssigneeTriad National Security, LLC
InventorsRajinder Pal Singh, JongGeun Seong, Jeremy Charles Lewis, Kathryn A. Berchtold
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Abstract
Provided are methods of preparing carbon molecular sieve (CMS) hollow fiber membranes derived from polybenzimidazole (PBI) hollow fiber membranes, obtained by contacting a PBI hollow fiber membrane with a cross-linking or acid solution prior to carbonization. CMS hollow fiber membranes obtained by these methods, and methods of using said CMS hollow fiber membranes for fluid separation and purification, are also provided.
Claims5
A PBI-derived CMS hollow fiber membrane made by
- a method of preparing the polybenzimidazole-derived carbon molecular sieve (CMS) hollow fiber membrane, said method comprising:
- i) providing an asymmetric polybenzimidazole (PBI) hollow fiber membrane, said asymmetric PBI hollow fiber membrane comprising
- a) a porous support structure devoid of macrovoids;
- b) an integral porous selective layer in intimate contact with the porous support structure;
- and
- c) a lumen defined by the porous support structure,
- ii) contacting said asymmetric PBI hollow fiber membrane with
- a) an aqueous solution comprising a crosslinking agent, thereby forming a crosslinked asymmetric PBI hollow fiber membrane, or
- b) an aqueous solution comprising an acid, thereby forming an acid-doped asymmetric PBI hollow fiber membrane;
- and
- iii) pyrolyzing the crosslinked asymmetric PBI hollow fiber membrane or acid-doped asymmetric PBI hollow fiber membrane,
- thereby producing the PBI-derived CMS hollow fiber membrane.
9 more elements
A PBI-derived, pyrolyzed CMS hollow fiber membrane comprising:
- a) a crosslinked or acid-doped polybenzimidazole (PBI)-derived porous support structure devoid of macrovoids;
- b) an integral PBI-derived porous selective layer in intimate contact with the porous support structure;
- and
- c) a lumen defined by the porous support structure;
- wherein the PBI from which each of the porous support structure and the porous selective layer are derived is the same PBI.
2 more elements
Dependencies are inferred from the claim text.