Catalyst and process for purification of crude terephthalic acid

Details Catalyst and process for purification of crude terephthalic acid Catalyst and process for purification of crude terephthalic acid

1984-03-09

1988-12-13

Lone, Werren B.

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

Organic compounds

Carboxylic acids and salts thereof

502 85, 562412, C07C 5142

Patent

active

047912260

ABSTRACT:
A catalyst, a process for preparing said catalyst, and a process for producing purified terephthalic acid, wherein 4-carboxybenzaldehyde is reduced to very low levels, wherein said catalyst is prepared by contacting a solution of a suitable palladium salt in an organic solvent with a suitable activated carbon support, wherein said palladium salt is reduced to palladium metal crystallites by said activated carbon support. Purified terephthalic acid is prepared by hydrogenating crude terephthalic acid in the presence of said catalyst.

REFERENCES:
patent: 3522298 (1970-07-01), Bryant et al.
patent: 3546285 (1970-12-01), Witt
patent: 3629328 (1971-12-01), Stautzenberger et al.
patent: 3637831 (1972-01-01), Remsberg
patent: 3654350 (1972-04-01), Witt et al.
patent: 4467111 (1984-08-01), Puskas et al.

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