Gas separation: processes – Selective diffusion of gases – Selective diffusion of gases through substantially solid...
Reexamination Certificate
2007-02-26
2011-12-27
Greene, Jason M (Department: 1776)
Gas separation: processes
Selective diffusion of gases
Selective diffusion of gases through substantially solid...
C095S043000, C096S004000, C096S011000, C427S244000, C427S256000
Reexamination Certificate
active
08083833
ABSTRACT:
This invention describes a new concept of flexible template-directed microporous partially pyrolyzed polymeric membranes which have greatly improved performance in separation of gas pairs compared to their precursor polymeric membranes. Organic hosts, such as crown ethers, cyclodextrins (CDs), calixarenes (CXs), and spherands, or polymeric additives, such as poly(ethylene glycol) (PEG) and polyvinylpyrrolidone (PVP) were used as the micropore-forming templates. Micropore-forming template/polymer blend membranes comprising organic micropore-forming templates embedded in a polymer matrix were prepared by dissolving the organic micropore-forming templates in the polymer solution followed by solution-casting and solvent evaporation or solvent exchange. Low-temperature selectively pyrolyzing micropore-forming templates in the micropore-forming template/polymer blend membranes at a nitrogen flow resulted in the formation of flexible microporous partially pyrolyzed polymeric membranes.
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Lesch David A.
Liu Chunqing
Wilson Stephen T.
Goldberg Mark
Greene Jason M
Shumate Anthony
UOP LLC
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