Crosslinkable copolyimide consisting mainly of repeating units derived from dianhydrides useful as membranes for separating various materials at high feed pressures with high selectivity and high permeability

    公开(公告)号:DE10247417A1

    公开(公告)日:2004-04-22

    申请号:DE10247417

    申请日:2002-10-11

    Abstract: A crosslinkable copolyimide consisting mainly of repeating units derived from dianhydrides of given formula and containing primary amine groups, where these are in the ortho, meta, or para positions to the ether function is new. A crosslinkable copolyimide consisting mainly of repeating units derived from dianhydides of formula:(A), diamines of formula (I), diamines of formula (II): where the amino groups are in the ortho, meta, or para position, and 1 or 2 aromatic nucleus H atoms can be substituted by 1-4X alkyl, and diamines of formula (III):and containing primary amine groups, where these are in the ortho, meta, or para positions to the ether function. R1 = COOH or SO3H. Independent claims are included for: (1) membranes obtained from the crosslinked copolyimides; (2) chromatography columns containing the crosslinked copolyimides as the stationary phase; (3) a method of separating alcohols from mixtures with organic compounds of lower polarity than the alcohol, for separation of ammonia or amines from mixtures with organic compounds of lower polarity than ammonia, and for separation of water, ammonia, H2S, or organic compounds from mixtures with nitrogen or air, separation of olefins or dienes from mixtures with hydrocarbons of higher degree of saturation than the olefin or diene, e.g. separation of olefin/alkane using the membranes described or chromatography columns; (4) an olefin/alkane mixture enriched in olefin compared with the starting mixture by means of a membrane as described, and an alkane enriched stream separated, at a pressure on the membrane feed side higher than 6 bar.

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