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:
Aug. 01, 2006
Filed:
Apr. 11, 2003
Applicants:
Juergen Herwig, Huenxe, DE;
Ralf Richter, Recklinghausen, DE;
Martin Roos, Haltern, DE;
Georg Oenbrink, Duelmen, DE;
Inventors:
Juergen Herwig, Huenxe, DE;
Ralf Richter, Recklinghausen, DE;
Martin Roos, Haltern, DE;
Georg Oenbrink, Duelmen, DE;
Assignee:
Degussa AG, Duesseldorf, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07C 51/16 (2006.01); C07C 51/27 (2006.01); C07C 51/42 (2006.01); C07C 51/245 (2006.01);
U.S. Cl.
CPC ...
Abstract
Degradation acids obtained in the synthesis of carboxylic acids, in particular dicarboxylic acids, having from 8 to 16 carbon atoms may be isolated by separating the degradation acids in the form of a solid from the crude reaction mixture, then washing the degradation acids in the form of an oil with water at an elevated temperature. The resulting degradation acids having low oxidant and metal contents, and the metal catalyst may be recirculated back to the process.