| 摘要 |
A method is provided for converting aromatic bis(ether N- organo substituted phthalimides) to aromatic bis(ether anhydrides) by heating a bisphasic aqueous-organic mixture of aromatic bis(ether N- organo substituted phthalimide), phthalic acid or phthalic anhydride and an exchange catalyst to effect an imide-anhydride exchange producing an aqueous phase containing aromatic bis (ether phthalic acid) and an organic phase containing N-organo substituted phthalimide. A continuous method is also provided by utilizing a heated coiled tube reactor whereby the aqueous phase and the organic phase can then be separated and the aromatic bis (ether phthalic anhydride) recovered from the aqueous phase. |
