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US 12,758,923 B2Granted
Methods for manufacturing hollow fiber carbon membranes
AssigneeDow Global Technologies LLC
InventorsAbhishek Roy, Thomas C. Fitzgibbons, Li Tang, Surendar R. Venna, Derrick W. Flick, Nikki J. Montanez, Hali J. McCurry, James B. Heard, Barry B. Fish
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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.
Claims12
A method of manufacturing a hollow fiber carbon membrane, the method comprising:
- 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, wherein the polymeric precursor comprises a polymer comprising monomers Ax, By, and Cz, wherein
- X, Y, and Z are a mole fraction of each of A, B, and C;
- a sum of X+Y+Z is less than or equal to 1;
- and
- A, B, and C are individually monomers, and wherein
- A is a monomer selected from the group consisting of 6FDA, ODPA, and BTDA;
- B is DAM;
- and
- C is a monomer selected from the group consisting of BPDA and PMDA.
8 more elements
Dependencies are inferred from the claim text.