Process for the purification of naphthalenedicarboxylic acid
Disclosed is a process for the purification of a naphthalenedicarboxylic acid (NDA) which has been manufactured by the oxidation of a dialkylnaphthalene in the presence of a molecular oxygen-containing gas and a heavy metal-containing catalyst and contains metal residues, e.g., cobalt and manganese...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | Disclosed is a process for the purification of a naphthalenedicarboxylic acid (NDA) which has been manufactured by the oxidation of a dialkylnaphthalene in the presence of a molecular oxygen-containing gas and a heavy metal-containing catalyst and contains metal residues, e.g., cobalt and manganese residues, as impurities. The process involves contacting an acetic acid slurry of a NDA, typically 2,6-naphthalenedicarboxylic acid, containing such metals, with acetic anhydride. |
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