Patent ID: 8993799
Filing Date: 2015-03-31
Classification: C07C

Abstract:
1. A method for producing a purified naphthalenedicarboxylic acid, comprising: (A1) a step of mixing a naphthalenedicarboxylic acid-containing material and an amine in a mixed liquid of water and an organic solvent to give a crystal of a naphthalenedicarboxylic acid amine salt; and (A2) a step of obtaining a purified naphthalenedicarboxylic acid from the crystal of the naphthalenedicarboxylic acid amine salt obtained in the step (A1), wherein: the step (A1) comprises: the amine addition rate in the step (A12) is from 0.002 to 0.4 mol/min relative to one mol of the naphthalenedicarboxylic acid.