Purification of crude terephthalic acid and catalysts...

C - Chemistry – Metallurgy – 07 – C

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C07C 51/487 (2006.01) B01J 21/18 (2006.01) B01J 23/44 (2006.01) B01J 35/02 (2006.01) B01J 35/06 (2006.01) B01J 35/10 (2006.01) C07B 35/02 (2006.01) C07C 29/17 (2006.01)

Patent

CA 2435918

The invention relates to a method for cleaning crude terephthalic acid by means of catalytic, hydrogenating aftertreatment using a catalyst material containing at least one hydrogenation metal applied to a carbon carrier consisting of carbon fibres. The invention also relates to a catalyst consisting of the at least one catalyst material containing the at least one hydrogenation metal applied to the carbon fibres, the BET surface of the carbon carrier being < 500 m2/g, and a monolithic catalyst consisting of said at least one catalyst material containing the at least one hydrogenation material applied to the carbon fibres, and at least one support element or skeleton element which differs from the catalyst material and is connected to the same, said element mechanically supporting the catalyst material and maintaining the same in a monolithic form. The invention further relates to a method for producing the monolithic catalyst and the use thereof, a reactor containing a plane catalyst material in the form of woven fabric, knitted fabric and/or felt, the use of the same and a method for the selective hydrogenation of carbon-carbon double or triple bonds and/or hydrogenable functional groups in organic compounds containing the same.

L'invention concerne un procédé pour nettoyer l'acide téréphtalique brut par retraitement d'hydrogénation catalytique au moyen d'un matériau catalyseur qui comporte au moins un métal d'hydrogénation placé sur un support de carbone composé de fibres de carbone. La présente invention porte également sur un catalyseur constitué du matériau catalyseur contenant le métal d'hydrogénation placé sur les fibres de carbone, la surface BET du support de carbone étant < 500 m?2¿/g, et sur un catalyseur monolithique comportant le matériau catalyseur contenant le métal d'hydrogénation placé sur les fibres de carbone, et au moins un élément d'ossature ou d'appui, relié au matériau catalyseur mais différent de celui-ci, cet élément supportant mécaniquement et maintenant le matériau catalyseur dans une forme monolithique. Ladite invention concerne également un procédé de fabrication du catalyseur monolithique et son utilisation, ainsi qu'un réacteur comprenant un matériau catalyseur plan sous forme de matériau tissé, tricoté et/ou de feutre, y compris son utilisation. La présente invention porte aussi sur un procédé d'hydrogénation sélective de liaisons doubles ou triples carbone-carbone et/ou de groupes fonctionnels hydrogénables dans des composés organiques les contenant.

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