Method for purifying terephthalic acid recycle streams

Details Method for purifying terephthalic acid recycle streams Method for purifying terephthalic acid recycle streams

1988-08-05

1989-05-23

Lone, Werren B.

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

Organic compounds

Carboxylic acids and salts thereof

562414, 562486, C07C 51487

Patent

active

048332690

ABSTRACT:
A process is disclosed for purifying a crude terephthalic acid mother liquor stream comprising oxidation catalysts, terephthalic acid, color bodies and impurities by hydrogenation in the presence of a rhodium-on-carbon catalyst wherein color bodies and impurities are hydrogenated to saturated compounds for subsequent oxidation to carbon oxides. The terephthalic acid in said stream is thereupon recovered.

REFERENCES:
patent: 4467110 (1984-08-01), Puskas et al.

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