Preparation of phthalic acid by solventless oxidation of liquid

Details Preparation of phthalic acid by solventless oxidation of liquid Preparation of phthalic acid by solventless oxidation of liquid

1978-01-05

1981-11-10

Siegel, Alan

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

Organic compounds

Carboxylic acids and salts thereof

562412, C07C 5116

Patent

active

042999774

ABSTRACT:
This invention relates to the preparation of o-phthalic acid by the oxidation of liquid o-xylene with a source of molecular oxygen at a temperature in the range of from 150.degree. C. up to 235.degree. C. in the presence of catalysis provided by the combination of components which include a source of bromine and at least cobalt as metal oxidation catalyst, in the presence of liquid water in an amount to activate said catalysis and solubilize a catalytically effective amount of metal oxidation catalyst in liquid phthalic acid and under conditions which retain substantially all the o-phthalic acid in the free acid form but in the absence of any material extraneous to the oxidation reaction or its products as solvent.
Such preparative process results in yields of 85 to 92 mole percent and higher to o-phthalic acid in but a single oxidation step with recycle thereto of only o-xylene vaporized from the reaction zone and recovered.

REFERENCES:
patent: 2552278 (1951-05-01), Hochwalt
patent: 2644840 (1953-07-01), Roebuck
patent: 2858334 (1958-10-01), Landau et al.
patent: 3920735 (1975-11-01), Wampfler et al.

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