PRODUCTION OF 3-HYDROXY-1,4-NAPHTHOQUINONE-2-SULFONIC ACID SALT

摘要

PURPOSE:To obtain the titled compound useful as a catalyst of a wet oxidative desulfurization process, easily, by oxidizing a naphthoquinonesulfonic acid salt or naphthohydroquinonesulfonic acid salt in an ammoniacal alkaline aqueous solution containing a salt. CONSTITUTION:The objective compound can be produced by oxidizing a naphthoquinonesulfonic acid salt or naphthohydroquinonesulfonic acid salt with air in an ammoniacal alkaline aqueous solution containing a salt such as thiosulfate, etc. It is preferable to carry out the reaction in the presence of a variable valence metal such as Fe to promote the oxidation reaction. EFFECT:Since the filtrate after the separation of crystal can be reused, the process is extremely advantageous from industrial viewpoint.