Process for removing naphthoquinone from phthalic anhydride prod

Details Process for removing naphthoquinone from phthalic anhydride prod Process for removing naphthoquinone from phthalic anhydride prod

1984-02-24

1985-10-15

Raymond, Richard L.

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549251, C07D30789

Patent

active

045475784

ABSTRACT:
The invention relates to a process for removing naphthoquinone from phthalic anhydride produced by the air oxidation of naphthalene or mixtures containing naphthalene. Specifically, crude phthalic anhydride containing naphthoquinone is treated at a temperature of 180.degree.-280.degree. C. with an unsaturated aliphatic oil produced by the polymerization of 1,3-dienes and optionally isomerized having a molecular weight of 800-5,000, and optionally in the presence of 1-40 ppm of alkali ions, relative to the crude phthalic anhydride.

REFERENCES:
patent: 3462461 (1969-08-01), Bloom et al.
patent: 4008255 (1977-02-01), Wirth et al.
patent: 4145353 (1979-03-01), Schenk et al.
patent: 4436922 (1984-03-01), Kita et al.

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