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US 8,337,598 B2Granted
Photo-crosslinked gas selective membranes as part of thin film composite hollow fiber membranes
AssigneeHoneywell International Inc.
InventorsStephen F. Yates, Matthew C. McGuirl, Tihomir G. Tonev, Chunqing Liu, Jeffrey Chiou, Amber Arzadon
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Abstract
A thin film composite membrane comprises a core layer and a sheath UV-crosslinked polymer layer. The thin film composite membrane is produced by the co-extrusion of two polymer solutions. The core layer and the sheath layer can be separately optimized. The sheath layer may be UV-crosslinked to provide stability and selectivity at the desired operating temperature of the composite membrane.
Claims12
A film composite hollow fiber membrane comprising:
- a porous core polymer layer comprising at least one polymer;
- and
- a sheath crosslinked polymer layer adjacent to said porous core polymer layer, wherein said sheath crosslinked polymer layer has a selective layer and comprises at least one crosslinked polymer that is a different polymer from said at least one polymer in said porous core polymer layer;
- wherein said sheath crosslinked polymer layer comprises between about 5% and about 20% by weight of the film composite hollow fiber membrane.
1 more element
A film composite hollow fiber gas separation membrane comprising:
- a porous core polymer layer;
- and
- a sheath UV-crosslinked polymer layer positioned radially outward from said porous core polymer layer, wherein said sheath UV-crosslinked polymer layer has a nonporous selective layer and comprises at least one UV-crosslinked polymer that is a different polymer from a polymer in the said porous core polymer layer, and
- wherein the sheath polymer layer includes an outside skin and an underlying portion,
- wherein the outside skin is less porous than the underlying portion.
2 more elements
Dependencies are inferred from the claim text.