Method for producing carbon molecular sieve membranes in controlled atmospheres
AssigneesGeorgia Tech Research Corporation, Shell Oil Company
InventorsMayumi Kiyono, Paul Jason Williams, William John Koros
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Abstract
The invention concerns carbon molecular sieve membranes (“CMS membranes”), and more particularly the use of such membranes in gas separation. In particular, the present disclosure concerns an advantageous method for producing CMS membranes with desired selectivity and permeability properties. By controlling and selecting the oxygen concentration in the pyrolysis atmosphere used to produce CMS membranes, membrane selectivity and permeability can be adjusted. Additionally, oxygen concentration can be used in conjunction with pyrolysis temperature to further produce tuned or optimized CMS membranes.
Claims24
A process for making a carbon membrane having a predetermined gas separation performance, comprising:
- (a) providing a polymer precursor;
- (b) heating said precursor to a temperature at which pyrolysis byproducts are evolved;
- and
- (c) doping the carbon membrane with oxygen by contacting said precursor with an oxygen-containing gas, the concentration of oxygen in said gas being selected to produce a carbon membrane having a predetermined gas separation performance.
Dependencies are inferred from the claim text.