Process for preventing blackening of phthalic acid

Details Process for preventing blackening of phthalic acid Process for preventing blackening of phthalic acid

1977-12-05

1980-07-22

Siegel, A.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5133

Patent

active

042141001

ABSTRACT:
In the production of phthalic acid by oxidizing, in a liquid phase, tolualdehyde with molecular oxygen or a gas containing the molecular oxygen in the presence of heavy metal salt containing a Mn salt, especially both Mn and Co salts, and a bromine compound, using a lower aliphatic monocarboxylic acid as a reaction solvent, a blackening of phthalic acid is effectively prevented by conducting the oxidation of tolualdehyde in the presence of an alkylbenzene in an amount satisfying the following formula (1);

REFERENCES:
patent: 2963509 (1960-12-01), Barker et al.
patent: 3334135 (1967-08-01), Ichikawa
patent: 3595908 (1971-07-01), Lumbroso et al.
patent: 3846487 (1974-11-01), Shigeyasu et al.
Olah, "Friedel-Crafts & Related Reactions", vol. 1, (1963), p. 116.

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