Process for the purification of terephthalic acid

Details Process for the purification of terephthalic acid Process for the purification of terephthalic acid

1981-03-16

1983-04-19

Siegel, Alan

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5142

Patent

active

043806627

ABSTRACT:
Disclosed is a process for the purification of a crude terephthalic acid product contaminated with up to 10% by weight of partially oxidized impurities including p-toluic acid and 4-carboxybenzaldehyde, comprising the steps of dissolving the crude product in water by heating up to a temperature at least about 5.degree. C. higher than necessary for having the resulting solution saturated with terephthalic acid; cooling the resulting solution down to a temperature not lower than about 185.degree. C. to precipitate purified crystals; recovering the purified crystals by solid-liquid separation at a temperature not lower than that used for the precipitation of the purified crystals; and washing the recovered crystals by contacting with water at a temperature which is at least as high as the temperature of the recovery step.

REFERENCES:
patent: 2838565 (1958-06-01), Heath et al.
patent: 3452088 (1969-06-01), Olsen et al.
patent: 3505398 (1970-04-01), Baldwin

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