The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 1984
Filed:
Dec. 21, 1982
Applicant:
Inventors:
Marcel Feld, Cologne, DE;
Gunter Zoche, Bonn-Beuel, DE;
Assignee:
Dynamit Nobel AG, Troisdorf, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ; C07F / ;
U.S. Cl.
CPC ...
2604 / ; 2604 / ; 562412 ; 562414 ; 562493 ; 562597 ; 502 24 ;
Abstract
A process is provided for the recovery and recycling of spent cobalt and/or manganese catalysts used in the air oxidation of alkyl aromatics in acetic acid. The catalysts are isolated in the form of oxalates of extremely low solubility from the acetic acid mother liquors and the cobalt oxalate dihydrate and/or manganese oxalate dihydrate catalysts are restored by the joint action of hydrogen bromide and acetic anhydride, acetyl bromide, or a mixture thereof, to a form in which they are soluble in acetic acid and can be used, again, as oxidation catalysts.