Process for removing 1,4-naphthoquinone from phthalic anhydride

Details Process for removing 1,4-naphthoquinone from phthalic anhydride Process for removing 1,4-naphthoquinone from phthalic anhydride

1977-11-10

1979-03-20

Raymond, Richard L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260369, 2603464, C07D30789

Patent

active

041453530

ABSTRACT:
A process for removing 1,4-naphthoquinone from phthalic anhydride has now been found, which is characterized in that phthalic anhydride containing 1,4-naphthoquinone, or mixtures containing phthalic anhydride and also containing 1,4-naphthoquinone, are subjected to a heat treatment at temperatures from 200 .degree. to 300.degree. C. in the presence of 1,4,4a,9a-tetrahydroanthraquinone.

REFERENCES:
patent: 3870730 (1975-03-01), Scharfe et al.
patent: 4026770 (1977-05-01), Scharfe et al.

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