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:
Jan. 28, 2020
Filed:
Oct. 30, 2018
Applicant:
Ueno Fine Chemicals Industry, Ltd., Osaka-shi, Osaka, JP;
Inventors:
Takaya Hisano, Takarazuka, JP;
Masaki Hamaguchi, Kobe, JP;
Yusuke Kita, Yokkaichi, JP;
Ryota Motooka, Kobe, JP;
Chiaki Terao, Sanda, JP;
Assignee:
UENO FINE CHEMICALS INDUSTRY, LTD., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C 63/00 (2006.01); C07C 51/00 (2006.01); C07C 63/38 (2006.01); C07C 51/47 (2006.01); C07C 51/09 (2006.01); C07C 51/487 (2006.01);
U.S. Cl.
CPC ...
C07C 63/38 (2013.01); C07C 51/09 (2013.01); C07C 51/47 (2013.01); C07C 51/487 (2013.01);
Abstract
An object of the present invention is to provide a method for producing high-purity 2,6-NDA having a small alkali metal content. The present invention relates to a method for producing a high-purity 2,6-naphthalene dicarboxylic acid, comprising a purification step of washing a crude 2,6-naphthalene dicarboxylic acid having a specific surface area of 2 m/g or more in the presence of an aqueous medium under a temperature condition of 90° C. or more and less than 200° C.