Selective separation of iron by treatment with an ion-exchanging resin comprising diphosphonic acid groups
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United States of America Patent
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Mar 29, 2005
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N/A
app pub date -
Apr 23, 2002
filing date -
Jun 15, 1999
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Abstract
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.
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