| 摘要 |
<p>Disclosed is a process for the manufacture of 2,6-naphthalenedicarboxylic acic (NDA) by the liquid phase oxidation of 2,6-dimethylnaphthalene (DMN) with a molecular oxygen-containing gas in the presence of a catalyst system comprising cobalt, manganese and bromine and a solvent/reaction medium comprising acetic acid containing at least 15 weight percent water. The use of at least 15 weight percent water produces a crude NDA that contains relatively small amounts of residual catalyst metals in comparison to crude NDA produced by similar processes known in the art. In addition, the process results in a lower amount of the acetic acid solvent/reaction medium being oxidized (decomposed) during the oxidation process.</p> |
