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. 11, 2021
Filed:
Feb. 20, 2019
Applicant:
Kureha Corporation, Tokyo, JP;
Inventors:
Yuta Yamadoi, Tokyo, JP;
Yoshinori Suzuki, Tokyo, JP;
Takenori Tose, Tokyo, JP;
Haruyasu Yamaji, Tokyo, JP;
Toshihiko Ono, Tokyo, JP;
Assignee:
KUREHA CORPORATION, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 319/12 (2006.01); B01J 23/745 (2006.01); B01J 35/02 (2006.01);
U.S. Cl.
CPC ...
C07D 319/12 (2013.01); B01J 23/745 (2013.01); B01J 35/02 (2013.01);
Abstract
The object of the present invention is to provide a glycolide production method capable of further increasing the production rate of glycolide. The glycolide production method according to the present invention includes adding metal iron to an aqueous glycolic acid solution, subjecting glycolic acid contained in the aqueous glycolic acid solution to which the metal iron is added, to dehydrating polycondensation to obtain a glycolic acid oligomer, and heating and depolymerizing the glycolic acid oligomer to obtain glycolide.