Process for the purification of terephthalic acid

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

1978-03-21

1982-07-20

Siegel, Alan

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

Organic compounds

Carboxylic acids and salts thereof

562486, C07C 5142

Patent

active

043407528

ABSTRACT:
A process for the purification of terephthalic acid in which a dispersion of the terephthalic acid in a liquid dispersant such as acetic acid is continuously pumped repeatedly through a cycle. Fresh dispersion is fed continuously into the cycle while simultaneously a corresponding amount of treated dispersion is removed. The cycle comprises a heater and a cooler and the cooler serves as a crystallizer. The dispersion prior to entering the heater is subjected to a highly effective particle comminution and is exposed upstream of or in the heater to an oxygen containing gas such as air. The acetic acid dispersant is removed from the treated dispersion and recycled to the cycle.

REFERENCES:
patent: 3431296 (1969-03-01), Ichikawa et al.
patent: 3887612 (1975-06-01), Shigeyasu et al.

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