Process for the production of high purity terephthalic acids

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

C - Chemistry, Metallurgy

07

C

260/531.7

C07C 51/47 (2006.01) C07C 51/487 (2006.01) C07C 63/26 (2006.01)

Patent

CA 1296742

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

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