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:
Jan. 22, 2002
Filed:
Jun. 30, 1999
Mark W. Dassel, Indianola, WA (US);
Eustathios Vassiliou, Newark, DE (US);
RPC Inc., Atlanta, GA (US);
Abstract
This invention relates to methods of controlling the oxidation of hydrocarbons to respective dibasic acids, such as adipic acid for example, by removing the catalyst from the reaction mixture, outside the reaction zone, after the oxidation has taken place at least partially. The catalyst is precipitated substantially in its totality by using a base, preferably sodium hydroxide, to form the catalyst hydroxide, such as cobalt hydroxide for example. Preferably, the precipitated catalyst is recycled to the reaction zone with or without further treatment. The method may also include steps for treatment of the reaction mixture by hydrolysis and/or electrodialysis.