Methods for removing catalyst after oxidation of hydrocarbons
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United States of America Patent
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Sep 25, 2001
Grant Date -
N/A
app pub date -
Sep 19, 2000
filing date -
Jun 24, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to oxidative methods for controlling the oxidation of a class of compounds, including hydrocarbons, such as cyclohexane for example, alcohols, such as cyclohexanol for example, ketones, such as cyclohexanone for example, and peroxides, such as cyclohexylhydroperoxide for example, to intermediate oxidation products, such as adipic acid for example, by the removing the catalyst, such as cobalt compounds for example, from the oxidation mixture, outside the oxidation zone, after the oxidation has taken place at least partially. The catalyst is at least partially precipitated by following the steps of changing the temperature to be within a specific range, and sequentially reducing the water level to such a degree that causes the catalyst to precipitate. The precipitated catalyst is thereafter preferably filtered from the oxidation mixture and recycled to the oxidation zone.
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