| abstract |
(57) [Summary] [Object] To provide a method for producing bis (ether anhydride) which enables efficient imidization reaction, nitration reaction, substitution reaction and exchange reaction. [Structure] Carbon number 3 or more and boiling point range 45 to 250 ° C N-alkylphthalimide as an intermediate (imidation reaction) by reacting with phthalic anhydride in a liquid state using the above-mentioned alkylamine, and nitrating this to perform liquid / liquid extraction or vacuum extraction of the resulting N-alkylnitrophthalimide. Purified by distillation with dry bisphenol alkali salt and no solvent, Alternatively, it is reacted at a higher solids level to form a bisimide, which is converted to a bis (ether anhydride). |