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:
May. 19, 2009
Filed:
Oct. 18, 2004
Applicants:
Shinichi Nagao, Kurashiki, JP;
Hiroshi Ogawa, Kurashiki, JP;
Inventors:
Shinichi Nagao, Kurashiki, JP;
Hiroshi Ogawa, Kurashiki, JP;
Assignee:
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 61/00 (2006.01); C07C 51/16 (2006.01);
U.S. Cl.
CPC ...
Abstract
A process for producing pyromellitic acid which comprises step A for oxidizing durene, thereby obtaining a reaction mixture comprising trimethyl benzoic acid, trimethyl benzyl alcohol and trimethyl benzaldehyde, step B for separating trimethyl benzoic acid, trimethyl benzaldehyde and trimethyl benzyl alcohol from the reaction mixture obtained in step A, and step C for oxidizing trimethyl benzoic acid and/or trimethyl benzaldehyde separated in step B, thereby obtaining pyromellitic acid.