Process for the production of high purity terephthalic acid

Details Process for the production of high purity terephthalic acid Process for the production of high purity terephthalic acid

1991-10-24

1992-11-24

Dees, Jose G.

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

Organic compounds

Carboxylic acids and salts thereof

562485, 562486, C07C 51487

Patent

active

051664208

ABSTRACT:
A process for the production of high purity terephthalic acid, by subjecting a crude terephthalic acid product, resulting from the oxidation of a paradialkylbenzene and containing a 4-carboxybenzaldehyde and other impurities at a relatively high level, to an efficient purification with high yield of terephthalic acid. This process comprises subjecting a high temperature aqueous solution of the crude terephthalic acid product to (A) an oxidation treatment with an oxygen-containing gas while feeding oxygen at a feed rate in the range of 0.4-10 moles per mole of the 4-carboxylbenzaldehyde contained in the crude terephthalic acid and then to (B) a treatment with hydrogen.

REFERENCES:
patent: 3265729 (1966-08-01), Olsen et al.
patent: 4467110 (1984-08-01), Puskas et al.
patent: 4594449 (1986-06-01), Takuma et al.

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