Quality of phthalic acids improved by haloacetic acid

Details Quality of phthalic acids improved by haloacetic acid Quality of phthalic acids improved by haloacetic acid

1972-12-20

1976-03-30

Sutto, Anton H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C 5133

Patent

active

039474941

ABSTRACT:
Phthalic acids of improved quality are obtained direct from oxidation of xylenes with molecular oxygen in oxidation zone having small amounts of haloacetic acid present in liquid phase acetic acid solution of one or more heavy metal oxidation catalyst and bromide ion releasing bromine-containing compound. Particularly useful haloacetic acids are those having aqueous dissociation constant K.sub.A greater than 1.0 .times. 10.sup..sup.-3. Such quality improvement is manifested by decrease in carboxybenzaldehyde and toluic acid impurity contents and/or metal salt content.

REFERENCES:
patent: 2833816 (1958-05-01), Saffer
patent: 3162683 (1964-12-01), Jones et al.
patent: 3674845 (1972-07-01), Reni et al.
Ohta, Kogyo Kagaelar Zasshi, Vol. 63 No. 5 1960 pp. 768-773.

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