Method for the production of phenanthrenequinone
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United States of America Patent
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Apr 9, 1985
Grant Date -
N/A
app pub date -
Jan 30, 1984
filing date -
Feb 18, 1983
priority date (Note) -
Expired
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Abstract
Improvement of the yield and purity of phenanthrenequinone during its production by oxidation of phenanthrene by means of chromic acid in a sulfuric acidic medium is achieved by preparing a dispersion made up of phenanthrene, alkali dichromate and water at 95.degree.-100.degree. C., cooling said dispersion down to 80.degree.-85.degree. C. and carrying out the oxidation reaction under cooling and portion-wise addition of concentrated sulfuric acid in a temperature range between 80.degree. and 85.degree. C.
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