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. 08, 1980
Filed:
Nov. 17, 1978
Sydney G Horsfield, Wheaton, IL (US);
George E Kuhlmann, Naperville, IL (US);
Alan G Bemis, Naperville, IL (US);
Standard Oil Company (Indiana), Chicago, IL (US);
Abstract
This invention relates to the neat air oxidation of liquid o-xylene in a continuous manner in a single step to overcome the limited conversion of the process of British Patent Specification No. 856,245 or of the process of U.S. Pat. No. 3,920,735. More specifically this invention overcomes the limited conversion of o-xylene by its single step air oxidation in the presence of catalysis provided by ions of cobalt, manganese and bromine not only by maintaining the proper relationship of temperature, pressure and free water concentration in the reaction mixture to minimize the conversion of o-phthalic acid to its intramolecular anhydride but also by conducting the oxidation in the presence of small amounts of acetic or benzoic acid to make miscible the otherwise immiscible liquid phases of liquid o-xylene and liquid o-phthalic acid containing components of catalysis and free liquid water.