Process for the purification of anthraquinone
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United States of America Patent
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May 22, 1984
Grant Date -
N/A
app pub date -
Apr 29, 1982
filing date -
Jun 9, 1981
priority date (Note) -
Expired
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Abstract
In a process for purifying crude anthraquinone obtained by the oxidation, by molecular oxygen in an aqueous alkali metal hydroxide solution, of an adduct obtained by the Diels-Alder reaction of butadiene with 1,4-naphthoquinone obtained by a catalytic vapor phase oxidation reaction of naphthalene, an improvement characterized in that said crude anthraquinone is subjected to oxidation treatment in an aqueous medium in the presence of a hypochlorite.
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