Process for purifying terephthalic acid

Details Process for purifying terephthalic acid Process for purifying terephthalic acid

1980-05-06

1981-04-21

Siegel, Alan

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

Organic compounds

Carboxylic acids and salts thereof

562416, 562486, C07C 5142

Patent

active

042634520

ABSTRACT:
Crude terephthalic acid obtained by oxidation of p-tolualdehyde in a liquid phase with molecular oxygen in the presence of a bromine compound as a catalyst, using water as a solvent is purified by dissolving the crude terephthalic acid in water, hydrogenating the aqueous solution of terephthalic acid with molecular hydrogen in the presence of a hydrogenating catalyst, and recrystallizing the terephthalic acid from the hydrogenated aqueous solution, where an alkaline material such as a hydroxide, a carbonate, or a bicarbonate of sodium, potassium, calcium or barium is added to the aqueous solution of terephthalic acid to be purified before the hydrogenation.
The purified terephthalic acid has a very low 4-CBA content, and no hydrogenation catalyst activity is lowered by the addition of the alkaline material.

REFERENCES:
T 880,007, Paris et al., 11/24/70.

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