Process for the manufacture of aromatic polycarboxylic acids hav

Details Process for the manufacture of aromatic polycarboxylic acids hav Process for the manufacture of aromatic polycarboxylic acids hav

1981-12-04

1983-09-20

Trousof, Natalie

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

Organic compounds

Carboxylic acids and salts thereof

562412, 562485, C07C 5142

Patent

active

044058098

ABSTRACT:
A process for purifying aromatic polycarboxylic acid produced by liquid phase catalytic oxidation of polyalkyl aromatic hydrocarbon to remove undesirable aldehyde aromatic carboxylic acid and other impurities including the step of contacting an aqueous solution of said impure acid and hydrogen with a noble metal-containing catalyst, our improvement comprising eliminating any gas phase during the contacting step and conducting said contacting step with said aqueous solution by maintaining hydrogen at about 10 to about 75 percent of saturation in the liquid reaction medium to produce purified aromatic polycarboxylic acid having delta Y values below ten.

REFERENCES:
patent: 3151154 (1964-09-01), Sargent et al.
patent: 3456001 (1969-07-01), Olsen
patent: 3522298 (1970-07-01), Bryant et al.
patent: 3546285 (1970-12-01), Witt
patent: 3584039 (1971-06-01), Meyer
patent: 3639465 (1972-02-01), Olsen et al.
patent: 4126638 (1978-11-01), Alagy et al.
patent: 4260817 (1981-04-01), Thompson et al.

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