Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Reexamination Certificate
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
Chow Ming
Eyler Yvonne
Katakam Sudhakar
Mechema Chemicals International Corp.
Sinorica LLC
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