Process for producing purified terephthalic acid

Details Process for producing purified terephthalic acid Process for producing purified terephthalic acid

1980-04-23

1982-03-02

Siegel, Alan

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

Organic compounds

Carboxylic acids and salts thereof

C07C 5142

Patent

active

043179240

ABSTRACT:
A process for purifying crude terephthalic acid is disclosed which comprises treating a solution of crude terephthalic acid in an aqueous solution of a water-soluble heavy metal salt wherein the heavy metal is cobalt, manganese, iron or nickel under elevated pressure and at elevated temperature in the presence of a supported noble metal catalyst with nitrogen gas or a gas-mixture of nitrogen and hydrogen. The treated solution is then separated from the catalyst and purified crystalline terephthalic acid is recovered by crystallization and separation from the mother liquor wherein impurities and the heavy metal salts are retained. The process is especially useful for directly treating crude terephthalic acid obtained in an oxidation process in the presence of a heavy-metal-salt-catalyst.

REFERENCES:
patent: 3456001 (1969-07-01), Olsen
patent: 3607921 (1971-09-01), Stancell

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