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. 14, 1990
Filed:
Jun. 29, 1989
Michael R Green, Geneva, IL (US);
Wayne P Schammel, Naperville, IL (US);
Amoco Corporation, Chicago, IL (US);
Abstract
A process for the oxidation of pseudocumene to TMLA is disclosed which comprises catalytic oxidation of pseudocumene with air in the presence of acetic acid in an oxidation zone in the liquid phase wherein the weight ratio of acetic acid to pseudocumene is in the range of about 0.5-0:1.0 and the catalyst comprises one or more heavy metal oxidation catalysts comprising zirconium, cobalt, and manganese to provide about 0.1 to about 0.4 weight percent total metals based on pseudocumene and a source of bromine. The addition of the bromine component is controlled to provide a total of about 0.10 to about 0.30 weight percent total bromine based on pseudocumene. The total weight ratio of bromine ions to total metals ions is about 0.5 to about 2.0. The zirconium content is about 1 to about 5% and the manganese content is about 14 to about 60% each by weight of the total metals. The reaction temperature is about 300.degree. F. to about 420.degree. F. The crude trimellitic anhydride is hydrolyzed with water or a mixture of a low molecular weight carboxylic acid and water. Alternatively, a trimellitic anhydride/dimethylformamide adduct is prepared and this adduct is hydrolyzed with a mixture of a low molecular weight carboxylic acid and water. Trimellitic acid is useful in the manufacture of polyesters and polyamide-imides.