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    Method for producing an aromatic dianhydride
    3.
    发明授权
    Method for producing an aromatic dianhydride 有权

    公开(公告)号：US11787776B2

    公开(公告)日：2023-10-17

    申请号：US15733944

    申请日：2019-06-04

    Applicant: SHPP Global Technologies B.V.

    Inventor： Robert John Werling ,  Simon Padmanabhan ,  Aaron Matthew Royer ,  Bradley Osborne ,  Christopher Poirier

    IPC: C07D307/89 ,  C07D407/12 ,  C07D407/10

    CPC classification number: C07D307/89 ,  C07D407/10 ,  C07D407/12

    Abstract: A method for producing an aromatic dianhydride includes reacting an aromatic diimide with a substituted or unsubstituted phthalic anhydride in an aqueous medium in the presence of an amine exchange catalyst to provide an aqueous reaction mixture including an N-substituted phthalimide, an aromatic tetraacid salt, and at least one of an aromatic triacid salt and an aromatic imide diacid salt. The method further includes removing the phthalimide from the aqueous reaction mixture by extracting the aqueous reaction mixture with an organic solvent and converting to the corresponding aromatic dianhydride. The extracting is carried out in an extraction column including a high specific surface area metal packing material and having an interface between the aqueous reaction mixture and the organic solvent that is at a level that is 14 to 85% of the height of the extraction column.

    METHOD FOR ISOLATION OF A DIANHYDRIDE AND DIANHYDRIDES PREPARED BY THE METHOD
    8.
    发明申请
    METHOD FOR ISOLATION OF A DIANHYDRIDE AND DIANHYDRIDES PREPARED BY THE METHOD 审中-公开

    公开(公告)号：US20190119240A1

    公开(公告)日：2019-04-25

    申请号：US16096080

    申请日：2017-04-19

    Applicant: SABIC Global Technologies B.V

    Inventor： Aaron Royer ,  Robert J. Werling ,  Jorge Jimenez ,  Norman Enoch Johnson

    IPC: C07D307/89

    CPC classification number: C07D307/89

    Abstract: A method for producing an aromatic dianhydride includes reacting an aromatic diimide with a substituted or unsubstituted phthalic anhydride in an aqueous medium in the presence of an amine exchange catalyst to provide an aqueous reaction mixture including an N-substituted phthalimide, an aromatic tetraacid salt, and at least one of an aromatic triacid salt and an aromatic imide diacid salt. The method further includes removing the phthalimide from the aqueous reaction mixture by extracting the aqueous reaction mixture with an organic solvent for a first time period, at a first extraction temperature and subsequent to the first time period, extracting the aqueous reaction mixture with an organic solvent for a second time period, at a second extraction temperature. The aromatic tetraacid salt is converted to the corresponding aromatic dianhydride. Aromatic dianhydrides prepared according to the method are also described.

    Process for producing 4-azidosulfonylphthalic anhydride
    9.
    发明授权
    Process for producing 4-azidosulfonylphthalic anhydride 有权

    公开(公告)号：US10005751B2

    公开(公告)日：2018-06-26

    申请号：US15541207

    申请日：2015-12-28

    Applicant: Dow Global Technologies LLC

    Inventor： Matthew J. Jansma ,  Michael F. Gullo ,  John W. Hull, Jr.

    IPC: C07D307/89

    CPC classification number: C07D307/89

    Abstract: The present disclosure provides a process for the production of 4-azidosulfonylphthalic anhydride. In an embodiment, a process is provided and includes chlorinating 4-sulfophthalic acid trisodium salt (1), under solvent reaction conditions, to form a dissolved 4-chlorosulfonylphthalic anhydride (2) and an insoluble sodium chloride. The process includes first removing the insoluble sodium chloride from the dissolved 4-chlorosulfonylphthalic anhydride to form an isolated 4-chlorosulfonylphthalic anhydride. The process includes reacting, under solvent reaction conditions, the isolated 4-chlorosulfonylphthalic anhydride with sodium azide to form a dissolved 4-azidosulfonylphthalic anhydride and an insoluble sodium chloride. The process includes second removing the insoluble sodium chloride from the dissolved 4-azidosulfonylphthalic anhydride to form an isolated 4-azidosulfonylphthalic anhydride. The process includes retrieving a solid 4-azidosulfonylphthalic anhydride (3) from the isolated 4-azidosulfonylphthalic anhydride.

    PHTHALONITRILE COMPOUND
    10.
    发明申请
    PHTHALONITRILE COMPOUND 审中-公开

    公开(公告)号：US20180155276A1

    公开(公告)日：2018-06-07

    申请号：US15576009

    申请日：2016-09-26

    Applicant: LG CHEM, LTD.

    Inventor： Sang Woo KIM ,  Seung Hee LEE ,  Ki Ho AHN

    IPC: C07C255/54 ,  C07C317/36 ,  C07C321/30 ,  C08G73/10 ,  C07D307/89 ,  C08K3/013 ,  C08K5/00 ,  C09B47/06 ,  C09K11/06

    Abstract: The present application can provide a phthalonitrile compound and a use thereof. The present application can provide a phthalonitrile compound capable of forming a phthalonitrile resin by self-curing or of serving as a curing agent after being mixed with another phthalonitrile compound, and a use of the phthalonitrile compound. The phthalonitrile compound can form a phthalonitrile resin by rapid self-curing even at a low temperature and does not create any defects resulting from the use of a conventional curing agent. Also, the phthalonitrile compound can be applied as a curing agent after being mixed with another compound, in which case, even if the content of the compound applied as a curing agent increases, the total content of the phthalonitrile resin obtained does not decrease, and thus a resin exhibiting an excellent degree of cure can be provided.

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