Gas separation: processes – Selective diffusion of gases – Selective diffusion of gases through substantially solid...
Reexamination Certificate
2008-01-10
2011-11-29
Greene, Jason M (Department: 1776)
Gas separation: processes
Selective diffusion of gases
Selective diffusion of gases through substantially solid...
C095S047000, C095S051000, C095S054000, C096S004000, C096S008000, C096S009000, C096S010000, C096S011000, C096S013000, C096S014000, C210S640000, C210S500270, C210S506000, C525S420000, C525S422000, C525S423000, C524S538000, C524S599000
Reexamination Certificate
active
08066799
ABSTRACT:
The present disclosure relates to a high molecular weight, monoesterified polyimide polymer. Such high molecular weight, monoesterified polyimide polymers are useful in forming crosslinked polymer membranes for the separation of fluid mixtures. According to its broadest aspect, the method of making a crosslinked membrane comprises the following steps: (a) preparing a polyimide polymer comprising carboxylic acid functional groups from a reaction solution comprising monomers and at least one solvent; (b) treating the polyimide polymer with a diol at esterification conditions in the presence of dehydrating conditions to form a monoesterified polyimide polymer; and (c) subjecting the monoesterified fiber to transesterification conditions to form a crosslinked fiber membrane, wherein the dehydrating conditions at least partially remove water produced during step (b). The crosslinked membranes can be used to separate at least one component from a feed stream including more than one component.
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Kronos William J.
Miller Stephen J.
Omole Imona C.
Chevron U.S.A. Inc.
Georgia Tech Research Corporation
Greene Jason M
Merchant & Gould
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