Process for the optimization of the manufacture of phthalic acid

Details Process for the optimization of the manufacture of phthalic acid Process for the optimization of the manufacture of phthalic acid

1978-01-30

1979-02-27

Raymond, Richard L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

2603467, C07D30789

Patent

active

041419090

ABSTRACT:
A process for the optimization of the manufacture of phthalic acid anhydride comprising the steps of subjecting o-xylene to a gas phase oxidation over catalysts containing vanadium oxide and titanium oxide at temperatures of from 300.degree. C. to 500.degree. C., wherein said temperature is at least 5.degree. C. to 20.degree. C. below the optimum temperature for conversion to phthalic acid anhydride with less than 0.1% by weight content of phthalide, recovering an impure phthalic acid anhydride containing more than 0.1% by weight of phthalide, subjecting said impure phthalic acid anhydride to countercurrent crystallization, and recovering phthalic acid anhydride crystals having a content of less than 0.1% by weight of phthalide.

REFERENCES:
patent: 3178452 (1965-04-01), Smith et al.
patent: 3306915 (1967-02-01), Vrbaski

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