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. 17, 1993
Filed:
Apr. 14, 1992
Eugene D Wilhoit, Victoria, TX (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A process for the production of dodecanedioic acid by oxidation of cyclododecene using a two liquid phase system comprised of valeric acid and aqueous cerium solutions containing nitrates and bisulfates in dilute nitric acid in which ruthenium tetroxide and lower oxides are dissolved or suspended. In this process cyclododecene is fed directly into the liquid phases which are continuously mixed and contained in an electrolytic cell loop operating at greater than 1.5 v in which the cerium +3 is oxidized to cerium +4 at the anode in a continuous fashion simultaneously with the ruthenium tetroxide oxidation of cyclododecene in the valeric acid. The cerium +4 regenerates the ruthenium tetroxide--simultaneously and in parallel with the other redox reactions. The process is also applicable to oxidation of cyclohexene to adipic acid.