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US 8,911,540 B2Granted
Gas separation membrane
AssigneeCase Western Reserve University
InventorsEric Baer, Shannon Armstrong, Benny D. Freeman, Donald R. Paul, Grant Offord
Life of this patent
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Abstract
A method of fabricating a gas separation membrane includes providing a coextruded multilayer film that includes a first polymer layer formed of a first polymer material and a second polymer layer formed of a second polymer material, the first polymer material having a first gas permeability. The coextruded multilayer film is axially oriented such that the second polymer layer has a second gas permeability that is greater than the first gas permeability.
Claims22
A gas separation membrane comprising:
- an axially oriented, coextruded multilayer film that has a CO2/O2 selectivity of at least about 4 and a flux of at least about 20 GPU, the axially oriented, coextruded multilayer film including at least one axially oriented, coextruded first polymer layer of a first polymer material and at least one axially oriented, coextruded second polymer layer of a second polymer material, the at least one axially oriented, coextruded first polymer layer having a first permeability (P1) prior to axial orientation and a second permeability (P2) after axially orientation less than or equal to the first permeability (P1), the at least one axially oriented, coextruded second polymer layer having a first permeability (P1a) prior to axial orientation and a second permeability (P2a) after axial orientation that is substantially greater than the first permeability (P1a) and the second permeability (P2).
A method of fabricating a gas separation membrane comprising:
- coextruding a first polymer material and a second polymer material to form a multilayer film that includes at least one coextruded first polymer layer and at least one coextruded second polymer layer, the at least one first polymer layer having a first permeability (P1) and a CO2/O2 selectivity of at least about 4;
- and
- axially orienting the coextruded multilayer film, the at least one axially oriented, coextruded first polymer layer having a second permeability (P2) after axial orientation less than or equal to the first permeability (P1), the at least one axially oriented, coextruded second polymer layer having a first permeability (P1a) prior to axial orientation and a second permeability (P2a) after axial orientation that is substantially greater than first permeability (P1a) and the second permeability (P2), wherein the axially oriented, coextruded multilayer film has a CO2/O2 selectivity of at least about 4 and a flux of at least about 20 GPU.
Dependencies are inferred from the claim text.