Purification of crude terephthalic acid

Details Purification of crude terephthalic acid Purification of crude terephthalic acid

1989-04-27

1990-01-09

Lone, Werren B.

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

Organic compounds

Carboxylic acids and salts thereof

502185, 562485, 562486, C07C 5142, B01J 2118

Patent

active

048929727

ABSTRACT:
Aqueous solutions of crude terephthalic acid are purified by hydrogenation in the presence of plural noble metal catalysts in separate layers. Initially, the solution to be purified is passed through a layer of ruthenium-on-carbon catalyst, rhodium-on-carbon catalyst, or platinum-on-carbon catalyst, and thereafter through a layer of palladium-on-carbon catalyst. Optionally, the purified aqueous terephthalic acid solution can be treated further to decrease the 4-carboxybenzaldehyde content thereof by passing it through a layer of rhodium-on-carbon catalyst downstream from the palladium-on-carbon catalyst layer.

REFERENCES:
patent: 3546285 (1970-12-01), Witt
patent: 3584039 (1971-06-01), Meyer
patent: 3639465 (1972-02-01), Olsen et al.
patent: 3726915 (1973-04-01), Pohlmann
patent: 4126638 (1978-11-01), Alagy et al.
patent: 4405809 (1983-09-01), Stech et al.
patent: 4467110 (1984-08-01), Puskas et al.

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