发明名称 |
Process to isolate dianhydrides |
摘要 |
<p>A process to isolate dianhydride from an exchange reaction comprises extracting a bisimide/anhydride exchange reaction aqueous phase with an organic solution comprising an exchange catalyst at a first temperature and pressure to form an extracted aqueous phase comprising water, exchange catalyst and a dianhydride precursor; removing water from the extracted aqueous phase at a second temperature and pressure to form a molten phase, wherein the second pressure is less than the first pressure; removing water and exchange catalyst from the molten phase at a third temperature and pressure to form an isolation mixture; and converting the dianhydride precursor in the isolation mixture to dianhydride at a fourth temperature and pressure, wherein the fourth temperature is greater than the second and third temperatures and the fourth pressure is less than the second and third pressures.</p> |
申请公布号 |
EP1362841(A1) |
申请公布日期 |
2003.11.19 |
申请号 |
EP20030252946 |
申请日期 |
2003.05.12 |
申请人 |
GENERAL ELECTRIC COMPANY |
发明人 |
GUGGENHEIM, THOMAS LINK;MONGILIO, DAVID ANTHONY |
分类号 |
C07C51/573;(IPC1-7):C07C51/573 |
主分类号 |
C07C51/573 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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