SELEKTIVE TRENNUNG VON EISEN MIT EINEM DIPHOSPHONSÄUREGRUPPEN ENTHALTENDEN IONENAUSTAUSCHERHARZ

摘要

The invention relates to a process for selectively separating iron from other metal ions, in particular ions present in certain oxidation catalysts.It also relates to a process 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 consists in 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.