Method of separating naphthoquinone from phthalic acid...

Details Method of separating naphthoquinone from phthalic acid... Method of separating naphthoquinone from phthalic acid...

C - Chemistry, Metallurgy

07

D

260/374.2

C07D 307/89 (2006.01) C07C 51/573 (2006.01)

Patent

CA 1232281

ABSTRACT OF THE DISCLOSURE A method for removing naphthoquinone from phthalic anhydride produced by air-oxidation of naphthalene or naphthalene-containing mixtures, which entails mixing an effective amount of l,5,9-cyclododecatriene or a distillation residue of the same or a mixture thereof with the naphthoquinone-containing phthalic anhydride at an elevated temperature.

497515

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