Asymmetric integrally-skinned flat sheet membranes for H2 purification and natural gas upgrading
AssigneeUop LLC
InventorsChunqing Liu, Howie Q. Tran
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Abstract
An asymmetric integrally-skinned flat sheet membrane comprising a miscible blend of an aromatic polyethersulfone (PES) polymer and an aromatic polyimide polymer is used for gas separations such as hydrogen purification, separation of hydrogen and methane and to separate other gases and liquids. UV radiation may be applied to the surface of the membrane for improved properties.
Claims7
An asymmetric integrally-skinned flat sheet gas separation membrane comprising a highly porous, non-selective symmetric woven Nylon fabric backing, a miscible blend of an aromatic polyethersulfone (PES) polymer and an aromatic polyimide polymer that comprises a plurality of repeating units of formula (I)
- wherein X1 is selected from the group consisting of
- wherein X2 is selected from the group consisting of
- wherein n and m are independent integers from 20 to 500 wherein said asymmetric integrally-skinned flat sheet membrane has a layer of said miscible blend of said PES polymer and said aromatic polyimide polymer with a thickness from 60 microns to 230 microns, and wherein said membrane has a hydrogen over methane selectivity of at least 100.
Dependencies are inferred from the claim text.