Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1989-11-15
1991-10-22
Spitzer, Robert
Gas separation
Means within gas stream for conducting concentrate to collector
55 16, 55 68, B01D 5322, B01D 7164
Patent
active
050592203
ABSTRACT:
Highly selective membranes for the separation of mixtures He/N.sub.2 and O.sub.2 /N.sub.2, which have suitable mechanical properties and high permeability are dislcosed. They consist of a polymeric porous base from poly-2,6-dimethyl-1,4-phenyleneoxide and a polymeric selective layer formed from polyamidoimide of the general formula I, where R= ##STR1## and n=140-220 ##STR2## or from an interpolymeric equimolar complex of PAI-1 with polyvinylpyrrolidone, or from an aromatic polyimide of the general formula II, where X is --O-- or ##STR3## and n=150-230 ##STR4## or of the general formula III, where n=150-240 ##STR5## or from polymeric imides of the general formula IV, where R=H or CH.sub.3 ##STR6## or also from their copolymers with styrene, methyl methacrylate, methyl acrylate, and dimethylaminoethyl methacrylate. A method for the preparation of composite polymeric membranes consists of saturation of the porous base from poly-2,6-dimethyl-1,4-phenyleneoxide with an organic solvent inert to it, e.g. with C.sub.7 H.sub.16 to C.sub.10 H.sub.22 aliphatic hydrocarbons or their mixtures, drying, and coating with a 1-25 wt.-% solution of the selective polymer in an organic solvent which is incompatible with the organic liquid, e.g. N-methylpyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide or their mixtures.
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Bleha Miroslav
Kuznecov Jurij P.
Lokaj Jan
Polockaja Galina A.
Romaskova Kira A.
Akademija Nauk SSSR
Ceskoslovenska akademie ved
Spitzer Robert
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