abstract |
(57) [Summary] [Problem] High-purity 2,6-naphthale from which residual nitrogen components have been removed To provide industrially advantageous method for producing dicarboxylic acid I do. SOLUTION: Obtained from an oxidation reaction of 2,6-alkylnaphthalene The crude 2,6-naphthalenedicarboxylic acid obtained as an amine salt or After making ammonium salt, the salt is decomposed and the particle size is 50μ m or less purified 2,6-naphthalenedicarboxylic acid crystals, 40 Heat treatment at ~ 350 ° C. |