An improved process for producing benzophenone-azine in which a catalyst can be removed, recovered and recycled is disclosed. The process comprises the steps of:(a) oxidizing benzophenone-imine with molecular oxygen in the presence of cuprous chloride catalyst to produce an oxidation reaction mixture containing benzophenone-azine;(b) contacting the oxidation reaction mixture obtained in step (a) with an aqueous solution containing ammonium chloride and hydrochloric acid to decompose the remaining benzophenone-imine substantially without causing decomposition of the produced benzophenone-azine and simultaneously to extract the catalyst from the oxidation reaction mixture;(c) separating the oxidation reaction mixture containing benzophenone-azine after the extraction in step (b) to recover benzophenone-azine as a solution;(d) neutralizing the catalyst-containing aqueous solution separated after the extraction step (b) with ammonia and then contacting the neutralized catalyst-containing aqueous solution with benzophenone-imine to extract the catalyst into benzophenone-imine; and(e) separating the benzophenone-imine solution containing the catalyst obtained after extraction in step (d) from the aqueous layer and recycling said solution to step (a) to reuse as a catalyst for step (a), without isolating the catalyst from said benzophenone-imine solution.