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公开(公告)号：WO2023004024A1
公开(公告)日：2023-01-26
申请号：PCT/US2022/037843
申请日：2022-07-21
Applicant: DOW GLOBAL TECHNOLOGIES LLC
Inventor： ROY, Abhishek , FITZGIBBONS, Thomas C. , TANG, Li , VENNA, Surendar R. , FLICK, Derrick W. , MONTANEZ, Nikki J. , MCCURRY, Hali J. , HEARD, James B. , FISH, Barry B.
Abstract: A method of manufacturing a hollow fiber carbon membrane, the method includes heating a polymeric precursor to a pyrolysis temperature that is greater than or equal to 900 °C and less than or equal to 1200 °C, and pyrolyzing the polymeric precursor at the pyrolysis temperature in a pyrolysis atmosphere that comprises oxygen in an amount that is greater than 0 ppm and less than 200 ppm.
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公开(公告)号：WO2023004020A1
公开(公告)日：2023-01-26
申请号：PCT/US2022/037838
申请日：2022-07-21
Applicant: DOW GLOBAL TECHNOLOGIES LLC
Inventor： ROY, Abhishek , FITZGIBBONS, Thomas C. , TANG, Li , VENNA, Surendar R. , FLICK, Derrick W. , MONTANEZ, Nikki J. , MCCURRY, Hali J. , HEARD, James B. , FISH, Barry B.
Abstract: A method of making a hollow fiber carbon molecular sieve (CMS) membrane includes heating a polymeric precursor to a pyrolysis temperature that is greater than or equal to 500 °C and less than or equal to 1200 °C; pyrolyzing the polymeric precursor at the pyrolysis temperature, thereby forming a pyrolyzed polymeric membrane; exposing the pyrolyzed polymeric membrane to an atmosphere comprising greater than or equal to 50 ppm oxidant; and cooling the pyrolyzed polymeric membrane to a cooling temperature that is less than or equal to 50 °C. The exposing and the cooling are performed sequentially or simultaneously, thereby forming the hollow fiber CMS membrane.
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公开(公告)号：WO2023004022A1
公开(公告)日：2023-01-26
申请号：PCT/US2022/037840
申请日：2022-07-21
Applicant: DOW GLOBAL TECHNOLOGIES LLC
Inventor： ROY, Abhishek , FITZGIBBONS, Thomas C. , TANG, Li , VENNA, Surendar R. , FLICK, Derrick W. , MONTANEZ, Nikki J. , MCCURRY, Hali J. , HEARD, James B. , FISH, Barry B.
Abstract: An article includes an asymmetric hollow fiber CMS membrane made by a method comprising: heating a polymeric precursor to a pyrolysis temperature from 500 °C to 1200 °C; pyrolyzing the polymeric precursor at the pyrolysis temperature, thereby forming a pyrolyzed polymeric membrane; exposing the pyrolyzed polymeric membrane to an atmosphere comprising ≥ 50 ppm oxidant; and cooling the pyrolyzed polymeric membrane to a cooling temperature that is ≤ 50 °C. The exposing and the cooling are performed sequentially or simultaneously, thereby forming the hollow fiber CMS membrane. The hollow fiber CMS membrane has a permeate/retentate selectivity ≥ 5 and a permeate permeability ≥ 50 GPU when measured while separating an analyte stream comprising the permeate and the retentate at a temperature from 20 °C to 30 °C.
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