Process for purification of aromatic carboxylic acids

C - Chemistry – Metallurgy – 07 – C

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

Patent

CA 2590371

Impure aromatic carboxylic acids such as are obtained by liquid phase oxidation of feed materials comprising aromatic compounds with substituent groups oxidizable to carboxylic acid groups, or comprising aromatic carboxylic acid and one or more aromatic carbonyl impurities that form hydrogenated species more soluble in aqueous solvents or with less color or color-forming tendencies than the aromatic carbonyl impurity, are purified to an aromatic carboxylic acid product with lower levels of impurities by a process comprising contacting an aqueous solution comprising the impure aromatic carboxylic acid with hydrogen at elevated temperature and pressure with an attrition~resistant, acid stable catalyst composition comprising at least one hydrogenation catalyst metal and a support comprising relatively high surface area silicon carbide.

L'invention concerne des acides carboxyliques aromatiques impurs issus par exemple de l'oxydation en phase liquide de matériaux de charge qui contiennent des composés aromatiques avec groupes substituants oxydables en groupes d'acides carboxyliques, ou bien qui contiennent un acide carboxylique aromatique et une ou plusieurs impuretés carbonyle aromatiques formant une espèce hydrogénée plus soluble dans des solvants aqueux ou avec moins de couleur ou moins de tendances à formation de couleur que l'impureté carbonyle aromatique. Il s'agit de purifier ce type d'acide impur en acide carboxylique aromatique à teneurs en impuretés plus faibles, selon un procédé consistant à mettre en contact une solution aqueuse qui renferme l'acide impur en question et de l'hydrogène, à une température et une pression élevées, avec une composition catalytique stable en milieu acide, qui résiste à l'attrition, renfermant au moins un métal catalyseur d'hydrogénation et un support qui comprend du carbure de silicium à surface spécifique relativement importante.

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