Manufacture of phthalic anhydride by gas phase oxidation of a mi

Details Manufacture of phthalic anhydride by gas phase oxidation of a mi Manufacture of phthalic anhydride by gas phase oxidation of a mi

1988-06-08

1989-08-08

Raymond, Richard L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549249, C07D30789

Patent

active

048554588

ABSTRACT:
A process for the manufacture of phthalic anhydride by oxidation in the gas phase of an o-xylol naphthalene mixture. By producing a solution of 1 to 80 parts by mass naphthalene in 99 to 20 parts by mass o-xylol at a temperature of 0.degree. to 80.degree. C., storing the solution at that temperature, heating the solution only shortly prior to the reaction to 110.degree. to 180.degree. C., atomizing the heated solution into a hot airflow, passing the heated solution over metal oxide catalysts in the gas phase and collecting phthalic anhydride product, a problem-free manufacture of phthalic anhydride is attained.

REFERENCES:
patent: 4077984 (1978-03-01), Blechschmitt et al.
patent: 4472587 (1984-09-01), Benedetti et al.

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