| 摘要 |
<p>The invention provides a method for purifying a crude naphthalenedicarboxylic acid comprising the steps of mixing a crude naphthalenedicarboxylic acid and a water/alcohol solvent to esterify a part of the naphthalenedicarboxylic acid, thereby dissolving a naphthalenedicarboxylic ester into the solvent, and then contacting the resulting reaction mixture with hydrogen in the presence of a hydrogenation catalyst to hydrogenate impurities which are contained in the crude naphthalenedicarboxylic acid and which are capable of being hydrogenated, thereby dissolving and removing hydrogenation products into the water/methanol solvent. A mixture of a naphthalenedicarboxylic acid and a naphthalendicarboxylic ester with reduced impurity contents, or a high-purity naphthalenedicarboxylic acid can be obtained.</p> |
