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:
Jun. 29, 2021
Filed:
Sep. 10, 2019
Applicant:
Mitsubishi Gas Chemical Company, Inc., Tokyo, JP;
Inventor:
Kuniaki Muneyasu, Niigata, JP;
Assignee:
MITSUBISHI GAS CHEMICAL COMPANY, INC., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C 67/56 (2006.01); B01J 41/07 (2017.01); C07C 69/68 (2006.01); B01J 39/26 (2006.01); B01J 41/20 (2006.01); B01J 47/028 (2017.01);
U.S. Cl.
CPC ...
C07C 67/56 (2013.01); B01J 39/26 (2013.01); B01J 41/07 (2017.01); B01J 41/20 (2013.01); B01J 47/028 (2013.01); C07C 69/68 (2013.01);
Abstract
A method for producing a high-purity carboxylic acid ester, the method including bringing a crude carboxylic acid ester that contains anionic impurities and Ag, Al, Au, Ca, Cr, Cu, Fe, K, Mg, Na, Sn, and Zn metal impurities into contact with a cation-exchange resin, followed by bringing the crude carboxylic acid ester into contact with an anion-exchange resin to obtain to provide a high-purity carboxylic acid ester in which the Ag, Al, Au, Ca, Cr, Cu, Fe, K, Mg, Na, Sn, and Zn metal impurity content are each less than 1 ppb and the anionic impurity content is less than 1 ppm.