PROCESS FOR THE PRODUCTION OF HIGH PURITY TEREPHTHALIC ACIDS
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 terepht...
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| Format: | Patent |
| Sprache: | eng ; fre |
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| Zusammenfassung: | 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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