摘要 |
<p>The production of low color polyetherimides, including its intermediates, such as bisimides and diaryl diether dianhydrides, may be affected by producing an improved purity intermediate of 4-nitro-N-alkylphthalimide. A salt, such as alkali metal carbonate or alkali metal hydrogen carbonate, is added to an aqueous mixture of 4-nitro-N-alkylphthalimide and 3-nitro-N-alkylphthalimide to selectively hydrolyze the imide linkage of 3-nitro-Nalkylphthalimide forming a water-soluble acid-amide salt. An organic solvent is added to this salt mixture to phase separate 4-nitro-N-alkylphthalimide having dissolved in the organic solvent from acid-amide salt of 3-nitro-N-alkylphthalimide having dissolved in water.</p> |
申请人 |
SABIC INNOVATIVE PLASTICS IP B.V.;GUGGENHEIM, THOMAS, LINK;ODLE, ROY, RAY;VENKATARAMAN, KARTHIK |
发明人 |
GUGGENHEIM, THOMAS, LINK;ODLE, ROY, RAY;VENKATARAMAN, KARTHIK |