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. 09, 1983
Filed:
Jun. 14, 1982
Applicant:
Inventors:
Takashi Suzuki, Niigata, JP;
Koichi Kitahara, Niigata, JP;
Susumu Naito, Niigata, JP;
Tomoji Tsuji, Niigata, JP;
Assignee:
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562413 ;
Abstract
Trimellitic acid is produced in higher yield by liquid phase air oxidation of pseudocumene in acetic acid as a solvent in the presence of cobalt, manganese, and bromine as a catalyst, where the oxidation is carried out at two stages comprising a first stage of reaction at a temperature of 110.degree. to 170.degree. C. and a second stage of reaction at a temperature of 180.degree. to 240.degree. C. while maintaining a reaction pressure under a condition of the following formula throughout the reaction: