| 摘要 |
PURPOSE:To obtain the titled compound in high selectivity and simultaneously recover a solvent of a used acidic solution and efficiently reutilize the solvent, by oxidizing naphthalene in the liquid phase with an acidic aqueous solution containing ceric ions in a low concentration at a low temperature while irradiating the reaction solution with ultrasonic waves. CONSTITUTION:Naphthalene is oxidized in the liquid phase with an acidic aqueous solution containing ceric ions to afford 1,4-naphthoquinone. In the process, an acidic aqueous solution containing cerous ions is electrolytically oxidized in an electrolytic cell 2 to convert the cerous ions in the above- mentioned aqueous solution into ceric ions. The resultant solution is then fed to a reactor 4 and the naphthalene is oxidized in the liquid phase while irradiating the reaction solution with ultrasonic waves. An organic solvent (e.g. benzene), immiscible with water and unoxidized with the ceric ions is used to extract the 1,4-naphthoquinone in an extraction column 5. The organic solvent phase is then separated to separate and purify the 1,4-naphthoquinone therefrom. The unreacted naphthalene, organic solvent and acidic aqueous solution phases are respectively returned to the original places.
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