| abstract |
(57) [Problem] To provide a method for industrially and advantageously producing a 2,6-naphthalenedicarboxylic acid having a good hue and a high purity from a crude 2,6-naphthalenedicarboxylic acid at a high recovery rate. I do. SOLUTION: An aliphatic or alicyclic amine salt of crude 2,6-naphthalenedicarboxylic acid is crystallized with a mixed solvent of water and acetonitrile, and the amine salt of 2,6-naphthalenedicarboxylic acid purified by crystallization is obtained. A high-purity 2,6-naphthalenedicarboxylic acid is produced by distilling an aliphatic or alicyclic amine by heating in the presence of water. |