Process for the preparation of diacids from the washing waters of cyclohexane oxidation products
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United States of America Patent
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Jan 18, 2000
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app pub date -
Dec 12, 1997
filing date -
Dec 12, 1996
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Abstract
The present invention relates to a process for the preparation of diacids or mixtures of diacids from aqueous solutions derived from the washing of cyclohexane oxidation products. More specifically, the present invention provides a process for the preparation of aliphatic diacids from washing waters derived from a process for the oxidation of cyclohexane and containing peroxides, the process of the invention comprising successively: (a) at least partially deperoxidizing said washing waters by subjecting them to catalytic hydrogenation at a temperature of between about 0.degree. C. and about 100.degree. C., in the presence of at least one platinum group metal; (b) oxidizing with nitric acid the products contained in the washing waters after deperoxidation.
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