Invention Grant
- Patent Title: Method for isolation of a dianhydride and dianhydrides prepared by the method
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Application No.: US16096080Application Date: 2017-04-19
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Publication No.: US10407397B2Publication Date: 2019-09-10
- Inventor: Aaron Royer , Robert J. Werling , Jorge Jimenez , Norman Enoch Johnson
- Applicant: SABIC Global Technologies B.V
- Applicant Address: NL Bergen op Zoom
- Assignee: SABIC GLOBAL TECHNOLOGIES B.V.
- Current Assignee: SABIC GLOBAL TECHNOLOGIES B.V.
- Current Assignee Address: NL Bergen op Zoom
- Agency: Cantor Colburn LLP
- International Application: PCT/US2017/028263 WO 20170419
- International Announcement: WO2017/189293 WO 20171102
- Main IPC: C07D307/89
- IPC: 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.
Public/Granted literature
- US20190119240A1 METHOD FOR ISOLATION OF A DIANHYDRIDE AND DIANHYDRIDES PREPARED BY THE METHOD Public/Granted day:2019-04-25
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