System and method for recovering CTA residues and...

Details System and method for recovering CTA residues and... System and method for recovering CTA residues and...

2007-10-23

2007-10-23

Eyler, Yvonne (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

C562S412000, C562S485000

Reexamination Certificate

active

11558976

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.

REFERENCES:
patent: 4786752 (1988-11-01), Holzhauer et al.
patent: 5955394 (1999-09-01), Kelly

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