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:
Oct. 08, 1991
Filed:
Dec. 19, 1989
Yakudo Tachibana, Kasukabe, JP;
Kazuhiko Tate, Yokohama, JP;
Masami Ono, Yokohama, JP;
Nobuhiro Takei, Yokohama, JP;
Jun Miki, Yokohama, JP;
Hiroaki Taniguchi, Kuki, JP;
Yoshimi Shiroto, Yokohama, JP;
Misunori Shimura, Yokohama, JP;
Yoshio Fukui, Tokyo, JP;
NKK Corporation, both of, JP;
Chiyoda Corporation, both of, JP;
Abstract
A process for the preparation of naphthalene mono or polycarboxylic acids, such as 2,6-naphthalene dicarboxylic acid, is disclosed which includes oxidizing a naphthalene compound such as 2,6-diisopropylnaphthalene in a specific solvent with molecular oxygen in the presence of a catalyst containing a heavy metal compound and a bromine compound. The solvent is an aliphatic monocarboxylic acid and may further contain benzene and/or water. By controlling the ratio of the amount of catalyst metal to the feed rate of the raw material naphthalene compound, the yield of desired product can be controlled.