A process is described for recycling catalysts in the reaction for the oxidation
of alcohols and/or ketones to carboxylic acids and more particularly the oxidation
of cyclic alcohols and/or cyclic ketones to dicarboxylic acids, such as the oxidation
of cyclohexanol and/or cyclohexanone to adipic acid. This process involves treating
the solution comprising the oxidation catalyst, before it is recycled, with an
ion-exchange resin which makes it possible to selectively separate the iron from
the other metal elements, in particular from copper and from vanadium.