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:
Jul. 06, 2004
Filed:
Nov. 13, 2002
John Klier, Midland, MI (US);
Christopher J. Tucker, Bay City, MI (US);
Thomas H. Kalantar, Midland, MI (US);
Kenneth A. Burdett, Midland, MI (US);
Daniel Patrick Green, Midland, MI (US);
Luciano Piras, Milan, IT;
Sergio Schena, Mantova, IT;
Guo-shuh John Lee, Midland, MI (US);
The Dow Chemical Company, Midland, MI (US);
Abstract
The present invention pertains to an improved method of oxidizing substituted aromatic compounds (such as p xylene) to their corresponding aromatic acids (such as terephthalic acid). The improvement involves carrying out the oxidation reaction in an aqueous medium, wherein the aqueous medium contains at least 30 percent water, preferably up to 30 percent surfactant and preferably a low molecular weight material containing a hydrophilic end group as a co-surfactant. The reaction is carried out at a pH of less than 3.0.