Patent ID: 8492583
Filing Date: 2013-07-23
Classification: B01J,C07C

Abstract:
1. A process for purifying an aromatic carboxylic acid comprising contacting with hydrogen under hydrogenation conditions at a temperature of about 200 to about 370° C. and in the presence of a catalyst an aqueous solution comprising an aromatic carboxylic acid, wherein the catalyst comprises particulates comprising a Group VIII hydrogenation catalyst metal disposed substantially on the surface of a support comprising silicon carbide having a BET surface area of at least about 10 m 2 /g and the catalyst has an initial attrition loss according to ASTM D-4058 up to about 1.2 wt % and the silicon carbide is stable in the aqueous solution under the hydrogenation reaction conditions such that stability of the catalyst is indicated by weight loss of less than about 2 wt % after 20 days exposure to an aqueous 20 wt % solution of terephthalic acid solution at about 275° C. and 850 psig.