Abstract: A system and a method for recovering PTA (purified terephthalic acid) mother liquid as well as purifying and regenerating catalyst, the system and the method is used mainly in manufacturing PTA wherein the mother liquid of the PTA generated by hydrogenation reaction is recovered by means of a PTA mother liquid recovering system to produce cobalt containing inorganic acid solution which is passed through a catalyst purifying/regenerating system and is electrolyzed with a cobalt purifying/regenerating system to produce metal cobalt which is then passed through an oxidized catalyst producing system to produce oxidized catalyst to be circulated for use in the process of manufacturing PTA.

Abstract: A system/method for recovering CTA (crude terephthalic acid) residues and purifying and regenerating catalyst, being used for recovering residues generated in the reaction processes of oxidation in manufacturing PTA (purified terephthalic acid) as well as purifying and regenerating the residues to form oxidized catalyst to be circulated for reusing; wherein there are mainly a CTA residue recovering system and a catalyst purifying/regenerating system. The CTA residue recovering system treats the CTA residues and collects metallic salt that is then sent to the catalyst purifying/regenerating system and is reduced by electrolyzing metal cobalt with a cobalt purifying/ regenerating system, then is passed to an oxidized catalyst producing system to produce oxidized catalyst to be circulated for use in the oxidation reaction process for manufacturing PTA.

Abstract: A catalytic solution system for manufacturing terephthalic acid is disclosed and its method. The system uses a Co—Mn—Br acetate solution (CMB) that is applied in an oxidation reaction, when the weight ratio of each component is (Co %×2.7)+(Mn %×2.9 %)>Br %. CoBr2 and MnBr2 are introduced as a source of Br for the CMB solution. Compensation for any shortage of Co and Mn, after such a supplement, can be made from cobalt acetate and manganese acetate without using highly corrosive HBr. The present invention provides a method of preparing a catalyst for manufacturing terephthalic, wherein, in the stirring action of para-xylene with a gas containing oxygen, the above catalytic solution system is used.