Methods of treating the oxidation mixture of hydrocarbons to respective dibasic acids
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United States of America Patent
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Jan 22, 2002
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N/A
app pub date -
Jun 30, 1999
filing date -
Jul 6, 1998
priority date (Note) -
Expired
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Abstract
This invention relates to methods of controlling the oxidation of hydrocarbons to respective dibasic acids, such as adipic acid for example, by removing the catalyst from the reaction mixture, outside the reaction zone, after the oxidation has taken place at least partially. The catalyst is precipitated substantially in its totality by using a base, preferably sodium hydroxide, to form the catalyst hydroxide, such as cobalt hydroxide for example. Preferably, the precipitated catalyst is recycled to the reaction zone with or without further treatment. The method may also include steps for treatment of the reaction mixture by hydrolysis and/or electrodialysis.
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