Sulfuric Acid → Naphthalene

Participants

Reaction Steps

The foregoing and other objects of the present invention have been attained by separating naphthoquinone having a purity of higher than 95% and phthalic acid from an aqueous slurry prepared by contacting a reaction mixture gas containing naphthoquinone, phthalic anhydride and sulfuric acid formed by a catalytic vapor phase oxidation of naphthalene with an aqueous medium, by adjusting the pH of the aqueous slurry to 1.2 to 5 and extracting the aqueous slurry with a chain or cyclic saturated hydrocarbon at 60° to 110° C. under the condition of substantially dissolving phthalic acid in the aqueous phase thereby separating a naphthoquinone solution phase, an aqueous phthalic acid solution phase and a resinous material phase.

Provenance & Evidence