| 摘要 |
PURPOSE:To produce the title compound by oxidizing a substituted naphthalene with an O2 gas in the presence of oxidizing catalysts of heavy metals of Ce, Co and Mn and bromine in a liquid phase, distilling away a solvent from the reaction product, dissolving the resulting substance in an alkali aqueous solution, recovering the insoluble catalyst, circulating and reusing the catalyst. CONSTITUTION:In obtaining a naphthalenecarboxylic acid(NCA) by oxidizing a substituted naphthalene with a molecular oxygen-containing gas in a solvent containing a lower aliphatic monocarboxylic acid by using oxidizing catalysts comprising a heavy metal consisting of cerium, cobalt and manganese and bromine in a liquid phase, the solvent is distilled away from the reaction product, an alkali aqueous solution is added to the resulting substance, a formed naphthalenecarboxylic acid is dissolved in the alkali aqueous solution and insoluble cerium, cobalt and manganese are recovered and effectively recycled and used. Consequently, the heavy metal catalysts can be recovered in high recovery ratio, a catalytic cost is inexpensive and this method is industrially advantageous. |
