Process for the purification of terephthalic acid

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

1980-10-17

1981-04-07

Siegel, Alan

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5142

Patent

active

042608171

ABSTRACT:
This invention relates to catalysis for example, the catalytic hydrogenation of impurities in terephthalic acid to yield terephthalic acid of sufficient purity for use in the production of polyester fibres. In more detail, the invention comprises the step of treating a solution of terephthalic acid with hydrogen gas in the presence of a catalyst comprising two or more of the metals platinum, palladium, rhodium, ruthenium, osmium and irridium.

REFERENCES:
patent: 3456001 (1969-07-01), Olsen
patent: 3546285 (1970-12-01), Witt
patent: 3607921 (1971-09-01), Stancell
patent: 3637831 (1972-01-01), Remsberg

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