abstract |
The present invention provides a method for purifying 6,6 ′-(ethylenedioxy) di-2-naphthoic acid, which is a raw material of a condensation polymer. SOLUTION: The 6,6 '-(ethylenedioxy) di-2-naphthoic acid dialkali metal salt is subjected to acid precipitation in a mixed solvent of water and a water-soluble organic solvent, or in the presence of a water-soluble organic solvent. A method for purifying 6,6 ′-(ethylenedioxy) di-2-naphthoic acid. [Selection figure] None |