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US 10,500,548 B2Granted
Composite nanoparticle stabilized core carbon molecular sieve hollow fiber membranes having improved permeance
AssigneeGeorgia Tech Research Corporation
InventorsWilliam John Koros, Kuang Zhang
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Abstract
Disclosed herein are asymmetric multilayer carbon molecular sieve (“CMS”) hollow fiber membranes and processes for preparing the membranes. The processes include simultaneously extruding a core dope containing a polymer and suitable nanoparticles, a sheath dope, and a bore fluid, followed by pyrolysis of the extruded fiber.
Claims20
A process for preparing an asymmetric multilayer carbon molecular sieve (CMS) hollow fiber membrane comprising
- a. co-extruding a core dope and a sheath dope through a spinneret to produce at least one multilayer CMS membrane precursor fiber,
- wherein the core dope comprises a first polymer, a first solvent, and a plurality of nanoparticles, and
- wherein the sheath dope comprises a second polymer and a second solvent;
- and
- b. pyrolyzing the at least one multilayer CMS membrane precursor fiber to form an asymmetric multilayer CMS hollow fiber membrane.
2 more elements
A process for preparing a multilayer hollow fiber membrane comprising:
- a. co-extruding a core dope and a sheath dope through a spinneret to produce at least one multilayer hollow fiber membrane precursor,
- wherein the core dope comprises a first polymer, a first solvent, and a plurality of nanoparticles, and
- wherein the sheath dope comprises a second polymer and a second solvent, wherein the second polymer is a thermally rearrangable polymer;
- and
- b. heating the multilayer hollow fiber membrane precursor at a temperature of between about 270° C. and about 450° C. for a period of about 1 to 4 hours to form an asymmetric composite thermally rearranged hollow fiber membrane.
2 more elements
An asymmetric multilayer CMS hollow fiber membrane comprising
- a. a core layer comprising a pyrolyzed first polymer and a plurality of nanoparticles, wherein the core layer has a substantially annular cross-section;
- and
- b. a sheath layer comprising a pyrolyzed second polymer, wherein the sheath layer has a substantially annular cross-section and is adjacent to and radially outward from the core layer.
Dependencies are inferred from the claim text.