Process for separation of naphthoquinone and phthalic acid
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United States of America Patent
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Oct 6, 1992
Issued Date -
N/A
app pub date -
Jun 25, 1982
filing date -
Apr 25, 1979
priority date (Note) -
Expired
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Abstract
Naphthoquinone having a purity of higher than 95% is separated from an aqueous slurry of naphthoquinone and phthalic acid prepared by contacting, with an aqueous medium, a reaction mixture gas containing naphthoquinone and phthalic anhydride formed by a catalytic vapor phase oxidation of naphthalene. An extraction of naphthoquinone is carried out with a chain or cyclic saturated hydrocarbon at 60.degree. to 110.degree. C. under the condition adjusting pH to 1.2 to 5 and substantially dissolving phthalic acid in the aqueous phase and leaving resinous materials as a bottom.
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